java.lang.Object
- java.lang.Enum<Elements>
- - org.openscience.cdk.config.Elements

All Implemented Interfaces:

Serializable, Comparable<Elements>
```
public enum Elements
extends Enum<Elements>
```
Enumeration of chemical elements. Data is taken from the Blue Obelisk Data Repository, version 3. This enumeration is auto-generated with utilities found in the 'cdk-build-utils' project.

Author:

egonw, john may

Source code:
main

Belongs to CDK module:
core

Enum Constant Summary

Enum Constants
Enum Constant	Description
`Actinium`
`Aluminium`
`Americium`
`Antimony`
`Argon`
`Arsenic`
`Astatine`
`Barium`
`Berkelium`
`Beryllium`
`Bismuth`
`Bohrium`
`Boron`
`Bromine`
`Cadmium`
`Caesium`
`Calcium`
`Californium`
`Carbon`
`Cerium`
`Chlorine`
`Chromium`
`Cobalt`
`Copernicium`
`Copper`
`Curium`
`Darmstadtium`
`Dubnium`
`Dysprosium`
`Einsteinium`
`Erbium`
`Europium`
`Fermium`
`Flerovium`
`Fluorine`
`Francium`
`Gadolinium`
`Gallium`
`Germanium`
`Gold`
`Hafnium`
`Hassium`
`Helium`
`Holmium`
`Hydrogen`
`Indium`
`Iodine`
`Iridium`
`Iron`
`Krypton`
`Lanthanum`
`Lawrencium`
`Lead`
`Lithium`
`Livermorium`
`Lutetium`
`Magnesium`
`Manganese`
`Meitnerium`
`Mendelevium`
`Mercury`
`Molybdenum`
`Moscovium`
`Neodymium`
`Neon`
`Neptunium`
`Nickel`
`Nihonium`
`Niobium`
`Nitrogen`
`Nobelium`
`Oganesson`
`Osmium`
`Oxygen`
`Palladium`
`Phosphorus`
`Platinum`
`Plutonium`
`Polonium`
`Potassium`
`Praseodymium`
`Promethium`
`Protactinium`
`Radium`
`Radon`
`Rhenium`
`Rhodium`
`Roentgenium`
`Rubidium`
`Ruthenium`
`Rutherfordium`
`Samarium`
`Scandium`
`Seaborgium`
`Selenium`
`Silicon`
`Silver`
`Sodium`
`Strontium`
`Sulfur`
`Tantalum`
`Technetium`
`Tellurium`
`Tennessine`
`Terbium`
`Thallium`
`Thorium`
`Thulium`
`Tin`
`Titanium`
`Tungsten`
`Unknown`
`Ununoctium`	Deprecated.
`Ununpentium`	Deprecated.
`Ununseptium`	Deprecated.
`Ununtrium`	Deprecated.
`Uranium`
`Vanadium`
`Xenon`
`Ytterbium`
`Yttrium`
`Zinc`
`Zirconium`

Field Summary

Fields
Modifier and Type	Field	Description
`static IElement`	`ACTINIUM`
`static IElement`	`ALUMINIUM`
`static IElement`	`AMERICIUM`
`static IElement`	`ANTIMONY`
`static IElement`	`ARGON`
`static IElement`	`ARSENIC`
`static IElement`	`ASTATINE`
`static IElement`	`BARIUM`
`static IElement`	`BERKELIUM`
`static IElement`	`BERYLLIUM`
`static IElement`	`BISMUTH`
`static IElement`	`BOHRIUM`
`static IElement`	`BORON`
`static IElement`	`BROMINE`
`static IElement`	`CADMIUM`
`static IElement`	`CAESIUM`
`static IElement`	`CALCIUM`
`static IElement`	`CALIFORNIUM`
`static IElement`	`CARBON`
`static IElement`	`CERIUM`
`static IElement`	`CHLORINE`
`static IElement`	`CHROMIUM`
`static IElement`	`COBALT`
`static IElement`	`COPPER`
`static IElement`	`CURIUM`
`static IElement`	`DARMSTADTIUM`
`static IElement`	`DUBNIUM`
`static IElement`	`DUMMY`	These instances are for backards compatability.
`static IElement`	`DYSPROSIUM`
`static IElement`	`EINSTEINIUM`
`static IElement`	`ERBIUM`
`static IElement`	`EUROPIUM`
`static IElement`	`FERMIUM`
`static IElement`	`FLEROVIUM`
`static IElement`	`FLUORINE`
`static IElement`	`FRANCIUM`
`static IElement`	`GADOLINIUM`
`static IElement`	`GALLIUM`
`static IElement`	`GERMANIUM`
`static IElement`	`GOLD`
`static IElement`	`HAFNIUM`
`static IElement`	`HASSIUM`
`static IElement`	`HELIUM`
`static IElement`	`HOLMIUM`
`static IElement`	`HYDROGEN`
`static IElement`	`INDIUM`
`static IElement`	`IODINE`
`static IElement`	`IRIDIUM`
`static IElement`	`IRON`
`static IElement`	`KRYPTON`
`static IElement`	`LANTHANUM`
`static IElement`	`LAWRENCIUM`
`static IElement`	`LEAD`
`static IElement`	`LITHIUM`
`static IElement`	`LIVERMORIUM`
`static IElement`	`LUTETIUM`
`static IElement`	`MAGNESIUM`
`static IElement`	`MANGANESE`
`static IElement`	`MEITNERIUM`
`static IElement`	`MENDELEVIUM`
`static IElement`	`MERCURY`
`static IElement`	`MOLYBDENUM`
`static IElement`	`NEODYMIUM`
`static IElement`	`NEON`
`static IElement`	`NEPTUNIUM`
`static IElement`	`NICKEL`
`static IElement`	`NIOBIUM`
`static IElement`	`NITROGEN`
`static IElement`	`NOBELIUM`
`static IElement`	`OSMIUM`
`static IElement`	`OXYGEN`
`static IElement`	`PALLADIUM`
`static IElement`	`PHOSPHORUS`
`static IElement`	`PLATINUM`
`static IElement`	`PLUTOMNIUM`	Deprecated.
`static IElement`	`PLUTONIUM`
`static IElement`	`POLONIUM`
`static IElement`	`POTASSIUM`
`static IElement`	`PRASEODYMIUM`
`static IElement`	`PROMETHIUM`
`static IElement`	`PROTACTINIUM`
`static IElement`	`RADIUM`
`static IElement`	`RADON`
`static IElement`	`RHENIUM`
`static IElement`	`RHODIUM`
`static IElement`	`ROENTGENIUM`
`static IElement`	`RUBIDIUM`
`static IElement`	`RUTHENIUM`
`static IElement`	`RUTHERFORDIUM`
`static IElement`	`SAMARIUM`
`static IElement`	`SCANDIUM`
`static IElement`	`SEABORGIUM`
`static IElement`	`SELENIUM`
`static IElement`	`SILICON`
`static IElement`	`SILVER`
`static IElement`	`SODIUM`
`static IElement`	`STRONTIUM`
`static IElement`	`SULFUR`
`static IElement`	`TANTALUM`
`static IElement`	`TECHNETIUM`
`static IElement`	`TELLURIUM`
`static IElement`	`TERBIUM`
`static IElement`	`THALLIUM`
`static IElement`	`THORIUM`
`static IElement`	`THULIUM`
`static IElement`	`TIN`
`static IElement`	`TITANIUM`
`static IElement`	`TUNGSTEN`
`static IElement`	`UNUNBIUM`
`static IElement`	`UNUNHEXIUM`
`static IElement`	`UNUNPENTIUM`
`static IElement`	`UNUNQUADIUM`
`static IElement`	`UNUNTRIUM`
`static IElement`	`URANIUM`
`static IElement`	`VANADIUM`
`static IElement`	`XENON`
`static IElement`	`YTTERBIUM`
`static IElement`	`YTTRIUM`
`static IElement`	`ZINC`
`static IElement`	`ZIRCONIUM`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Double`	`covalentRadius()`	The covalent radius, r_cov, is a measure of the size of an atom that forms part of one covalent bond.
`Double`	`electronegativity()`	Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom or a functional group to attract electrons (or electron density) towards itself.
`int`	`group()`	Return the group in the periodic table this element belongs to.
`static boolean`	`isMetal(int atno)`	Utility method to determine if an atomic number is a metal.
`static boolean`	`isMetal(IAtom atom)`	Utility method to determine if an atom is a metal.
`int`	`number()`	The atomic number of the element.
`static Elements`	`ofNumber(int number)`	Obtain the element with the specified atomic number.
`static Elements`	`ofString(String str)`	Obtain the element with the specified symbol or name.
`int`	`period()`	Return the period in the periodic table this element belongs to.
`String`	`symbol()`	The element symbol, C for carbon, N for nitrogen, Na for sodium, etc.
`IElement`	`toIElement()`	Access an `IElement` instance of the chemical element.
`static Elements`	`valueOf(String name)`	Returns the enum constant of this type with the specified name.
`static Elements[]`	`values()`	Returns an array containing the constants of this enum type, in the order they are declared.
`Double`	`vdwRadius()`	The van der Waals radius, r_w, of an atom is the radius of an imaginary hard sphere which can be used to model the atom.

Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

Unknown
```
public static final Elements Unknown
```

Hydrogen
```
public static final Elements Hydrogen
```

Helium
```
public static final Elements Helium
```

Lithium
```
public static final Elements Lithium
```

Beryllium
```
public static final Elements Beryllium
```

Boron
```
public static final Elements Boron
```

Carbon
```
public static final Elements Carbon
```

Nitrogen
```
public static final Elements Nitrogen
```

Oxygen
```
public static final Elements Oxygen
```

Fluorine
```
public static final Elements Fluorine
```

Neon
```
public static final Elements Neon
```

Sodium
```
public static final Elements Sodium
```

Magnesium
```
public static final Elements Magnesium
```

Aluminium
```
public static final Elements Aluminium
```

Silicon
```
public static final Elements Silicon
```

Phosphorus

public static final Elements Phosphorus

Sulfur
```
public static final Elements Sulfur
```

Chlorine
```
public static final Elements Chlorine
```

Argon
```
public static final Elements Argon
```

Potassium
```
public static final Elements Potassium
```

Calcium
```
public static final Elements Calcium
```

Scandium
```
public static final Elements Scandium
```

Titanium
```
public static final Elements Titanium
```

Vanadium
```
public static final Elements Vanadium
```

Chromium
```
public static final Elements Chromium
```

Manganese
```
public static final Elements Manganese
```

Iron
```
public static final Elements Iron
```

Cobalt
```
public static final Elements Cobalt
```

Nickel
```
public static final Elements Nickel
```

Copper
```
public static final Elements Copper
```

Zinc
```
public static final Elements Zinc
```

Gallium
```
public static final Elements Gallium
```

Germanium
```
public static final Elements Germanium
```

Arsenic
```
public static final Elements Arsenic
```

Selenium
```
public static final Elements Selenium
```

Bromine
```
public static final Elements Bromine
```

Krypton
```
public static final Elements Krypton
```

Rubidium
```
public static final Elements Rubidium
```

Strontium
```
public static final Elements Strontium
```

Yttrium
```
public static final Elements Yttrium
```

Zirconium
```
public static final Elements Zirconium
```

Niobium
```
public static final Elements Niobium
```

Molybdenum

public static final Elements Molybdenum

Technetium

public static final Elements Technetium

Ruthenium
```
public static final Elements Ruthenium
```

Rhodium
```
public static final Elements Rhodium
```

Palladium
```
public static final Elements Palladium
```

Silver
```
public static final Elements Silver
```

Cadmium
```
public static final Elements Cadmium
```

Indium
```
public static final Elements Indium
```

Tin
```
public static final Elements Tin
```

Antimony
```
public static final Elements Antimony
```

Tellurium
```
public static final Elements Tellurium
```

Iodine
```
public static final Elements Iodine
```

Xenon
```
public static final Elements Xenon
```

Caesium
```
public static final Elements Caesium
```

Barium
```
public static final Elements Barium
```

Lanthanum
```
public static final Elements Lanthanum
```

Cerium
```
public static final Elements Cerium
```

Praseodymium

public static final Elements Praseodymium

Neodymium
```
public static final Elements Neodymium
```

Promethium

public static final Elements Promethium

Samarium
```
public static final Elements Samarium
```

Europium
```
public static final Elements Europium
```

Gadolinium

public static final Elements Gadolinium

Terbium
```
public static final Elements Terbium
```

Dysprosium

public static final Elements Dysprosium

Holmium
```
public static final Elements Holmium
```

Erbium
```
public static final Elements Erbium
```

Thulium
```
public static final Elements Thulium
```

Ytterbium
```
public static final Elements Ytterbium
```

Lutetium
```
public static final Elements Lutetium
```

Hafnium
```
public static final Elements Hafnium
```

Tantalum
```
public static final Elements Tantalum
```

Tungsten
```
public static final Elements Tungsten
```

Rhenium
```
public static final Elements Rhenium
```

Osmium
```
public static final Elements Osmium
```

Iridium
```
public static final Elements Iridium
```

Platinum
```
public static final Elements Platinum
```

Gold
```
public static final Elements Gold
```

Mercury
```
public static final Elements Mercury
```

Thallium
```
public static final Elements Thallium
```

Lead
```
public static final Elements Lead
```

Bismuth
```
public static final Elements Bismuth
```

Polonium
```
public static final Elements Polonium
```

Astatine
```
public static final Elements Astatine
```

Radon
```
public static final Elements Radon
```

Francium
```
public static final Elements Francium
```

Radium
```
public static final Elements Radium
```

Actinium
```
public static final Elements Actinium
```

Thorium
```
public static final Elements Thorium
```

Protactinium

public static final Elements Protactinium

Uranium
```
public static final Elements Uranium
```

Neptunium
```
public static final Elements Neptunium
```

Plutonium
```
public static final Elements Plutonium
```

Americium
```
public static final Elements Americium
```

Curium
```
public static final Elements Curium
```

Berkelium
```
public static final Elements Berkelium
```

Californium

public static final Elements Californium

Einsteinium

public static final Elements Einsteinium

Fermium
```
public static final Elements Fermium
```

Mendelevium

public static final Elements Mendelevium

Nobelium
```
public static final Elements Nobelium
```

Lawrencium

public static final Elements Lawrencium

Rutherfordium

public static final Elements Rutherfordium

Dubnium
```
public static final Elements Dubnium
```

Seaborgium

public static final Elements Seaborgium

Bohrium
```
public static final Elements Bohrium
```

Hassium
```
public static final Elements Hassium
```

Meitnerium

public static final Elements Meitnerium

Darmstadtium

public static final Elements Darmstadtium

Roentgenium

public static final Elements Roentgenium

Copernicium

public static final Elements Copernicium

Ununtrium

@Deprecated
public static final Elements Ununtrium

Deprecated.

Nihonium
```
public static final Elements Nihonium
```

Flerovium
```
public static final Elements Flerovium
```

Ununpentium

@Deprecated
public static final Elements Ununpentium

Deprecated.

Moscovium
```
public static final Elements Moscovium
```

Livermorium

public static final Elements Livermorium

Ununseptium

@Deprecated
public static final Elements Ununseptium

Deprecated.

Tennessine

public static final Elements Tennessine

Ununoctium

@Deprecated
public static final Elements Ununoctium

Deprecated.

Oganesson
```
public static final Elements Oganesson
```

Field Detail

DUMMY
```
public static final IElement DUMMY
```
These instances are for backards compatability.

HYDROGEN
```
public static final IElement HYDROGEN
```

HELIUM
```
public static final IElement HELIUM
```

LITHIUM
```
public static final IElement LITHIUM
```

BERYLLIUM
```
public static final IElement BERYLLIUM
```

BORON
```
public static final IElement BORON
```

CARBON
```
public static final IElement CARBON
```

NITROGEN
```
public static final IElement NITROGEN
```

OXYGEN
```
public static final IElement OXYGEN
```

FLUORINE
```
public static final IElement FLUORINE
```

NEON
```
public static final IElement NEON
```

SODIUM
```
public static final IElement SODIUM
```

MAGNESIUM
```
public static final IElement MAGNESIUM
```

ALUMINIUM
```
public static final IElement ALUMINIUM
```

SILICON
```
public static final IElement SILICON
```

PHOSPHORUS

public static final IElement PHOSPHORUS

SULFUR
```
public static final IElement SULFUR
```

CHLORINE
```
public static final IElement CHLORINE
```

ARGON
```
public static final IElement ARGON
```

POTASSIUM
```
public static final IElement POTASSIUM
```

CALCIUM
```
public static final IElement CALCIUM
```

SCANDIUM
```
public static final IElement SCANDIUM
```

TITANIUM
```
public static final IElement TITANIUM
```

VANADIUM
```
public static final IElement VANADIUM
```

CHROMIUM
```
public static final IElement CHROMIUM
```

MANGANESE
```
public static final IElement MANGANESE
```

IRON
```
public static final IElement IRON
```

COBALT
```
public static final IElement COBALT
```

NICKEL
```
public static final IElement NICKEL
```

COPPER
```
public static final IElement COPPER
```

ZINC
```
public static final IElement ZINC
```

GALLIUM
```
public static final IElement GALLIUM
```

GERMANIUM
```
public static final IElement GERMANIUM
```

ARSENIC
```
public static final IElement ARSENIC
```

SELENIUM
```
public static final IElement SELENIUM
```

BROMINE
```
public static final IElement BROMINE
```

KRYPTON
```
public static final IElement KRYPTON
```

RUBIDIUM
```
public static final IElement RUBIDIUM
```

STRONTIUM
```
public static final IElement STRONTIUM
```

YTTRIUM
```
public static final IElement YTTRIUM
```

ZIRCONIUM
```
public static final IElement ZIRCONIUM
```

NIOBIUM
```
public static final IElement NIOBIUM
```

MOLYBDENUM

public static final IElement MOLYBDENUM

TECHNETIUM

public static final IElement TECHNETIUM

RUTHENIUM
```
public static final IElement RUTHENIUM
```

RHODIUM
```
public static final IElement RHODIUM
```

PALLADIUM
```
public static final IElement PALLADIUM
```

SILVER
```
public static final IElement SILVER
```

CADMIUM
```
public static final IElement CADMIUM
```

INDIUM
```
public static final IElement INDIUM
```

TIN
```
public static final IElement TIN
```

ANTIMONY
```
public static final IElement ANTIMONY
```

TELLURIUM
```
public static final IElement TELLURIUM
```

IODINE
```
public static final IElement IODINE
```

XENON
```
public static final IElement XENON
```

CAESIUM
```
public static final IElement CAESIUM
```

BARIUM
```
public static final IElement BARIUM
```

LANTHANUM
```
public static final IElement LANTHANUM
```

CERIUM
```
public static final IElement CERIUM
```

PRASEODYMIUM

public static final IElement PRASEODYMIUM

NEODYMIUM
```
public static final IElement NEODYMIUM
```

PROMETHIUM

public static final IElement PROMETHIUM

SAMARIUM
```
public static final IElement SAMARIUM
```

EUROPIUM
```
public static final IElement EUROPIUM
```

GADOLINIUM

public static final IElement GADOLINIUM

TERBIUM
```
public static final IElement TERBIUM
```

DYSPROSIUM

public static final IElement DYSPROSIUM

HOLMIUM
```
public static final IElement HOLMIUM
```

ERBIUM
```
public static final IElement ERBIUM
```

THULIUM
```
public static final IElement THULIUM
```

YTTERBIUM
```
public static final IElement YTTERBIUM
```

LUTETIUM
```
public static final IElement LUTETIUM
```

HAFNIUM
```
public static final IElement HAFNIUM
```

TANTALUM
```
public static final IElement TANTALUM
```

TUNGSTEN
```
public static final IElement TUNGSTEN
```

RHENIUM
```
public static final IElement RHENIUM
```

OSMIUM
```
public static final IElement OSMIUM
```

IRIDIUM
```
public static final IElement IRIDIUM
```

PLATINUM
```
public static final IElement PLATINUM
```

GOLD
```
public static final IElement GOLD
```

MERCURY
```
public static final IElement MERCURY
```

THALLIUM
```
public static final IElement THALLIUM
```

LEAD
```
public static final IElement LEAD
```

BISMUTH
```
public static final IElement BISMUTH
```

POLONIUM
```
public static final IElement POLONIUM
```

ASTATINE
```
public static final IElement ASTATINE
```

RADON
```
public static final IElement RADON
```

FRANCIUM
```
public static final IElement FRANCIUM
```

RADIUM
```
public static final IElement RADIUM
```

ACTINIUM
```
public static final IElement ACTINIUM
```

THORIUM
```
public static final IElement THORIUM
```

PROTACTINIUM

public static final IElement PROTACTINIUM

URANIUM
```
public static final IElement URANIUM
```

NEPTUNIUM
```
public static final IElement NEPTUNIUM
```

PLUTONIUM
```
public static final IElement PLUTONIUM
```

AMERICIUM
```
public static final IElement AMERICIUM
```

CURIUM
```
public static final IElement CURIUM
```

BERKELIUM
```
public static final IElement BERKELIUM
```

CALIFORNIUM

public static final IElement CALIFORNIUM

EINSTEINIUM

public static final IElement EINSTEINIUM

FERMIUM
```
public static final IElement FERMIUM
```

MENDELEVIUM

public static final IElement MENDELEVIUM

NOBELIUM
```
public static final IElement NOBELIUM
```

LAWRENCIUM

public static final IElement LAWRENCIUM

RUTHERFORDIUM

public static final IElement RUTHERFORDIUM

DUBNIUM
```
public static final IElement DUBNIUM
```

SEABORGIUM

public static final IElement SEABORGIUM

BOHRIUM
```
public static final IElement BOHRIUM
```

HASSIUM
```
public static final IElement HASSIUM
```

MEITNERIUM

public static final IElement MEITNERIUM

DARMSTADTIUM

public static final IElement DARMSTADTIUM

ROENTGENIUM

public static final IElement ROENTGENIUM

UNUNBIUM
```
public static final IElement UNUNBIUM
```

UNUNTRIUM
```
public static final IElement UNUNTRIUM
```

UNUNQUADIUM

public static final IElement UNUNQUADIUM

FLEROVIUM
```
public static final IElement FLEROVIUM
```

UNUNPENTIUM

public static final IElement UNUNPENTIUM

UNUNHEXIUM

public static final IElement UNUNHEXIUM

LIVERMORIUM

public static final IElement LIVERMORIUM

PLUTOMNIUM

@Deprecated
public static final IElement PLUTOMNIUM

Deprecated.

Method Detail
- values
```
public static Elements[] values()
```
  Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
```
for (Elements c : Elements.values())
    System.out.println(c);
```
  Returns:
  
  an array containing the constants of this enum type, in the order they are declared
- valueOf
```
public static Elements valueOf(String name)
```
  Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
  
  Parameters:
  
  name - the name of the enum constant to be returned.
  
  Returns:
  
  the enum constant with the specified name
  
  Throws:
  
  IllegalArgumentException - if this enum type has no constant with the specified name
  
  NullPointerException - if the argument is null
- number
```
public int number()
```
  The atomic number of the element. An Unknown element has an atomic number of '0'.
  
  Returns:
  
  0 - 116
- symbol
```
public String symbol()
```
  The element symbol, C for carbon, N for nitrogen, Na for sodium, etc. An Unknown element has no symbol.
  
  Returns:
  
  the symbol
- period
```
public int period()
```
  Return the period in the periodic table this element belongs to. If the element is Unknown it's period is 0.
  
  Returns:
  
  a period in the periodic table
- group
```
public int group()
```
  Return the group in the periodic table this element belongs to. If the element does not belong to a group then it's group is '0'.
  
  Returns:
  
  a group in the periodic table
- covalentRadius
```
public Double covalentRadius()
```
  The covalent radius, r_cov, is a measure of the size of an atom that forms part of one covalent bond.
  
  Returns:
  
  covalent radius - null if not available
  
  See Also:
  
  Covalent radius
- vdwRadius
```
public Double vdwRadius()
```
  The van der Waals radius, r_w, of an atom is the radius of an imaginary hard sphere which can be used to model the atom.
  
  Returns:
  
  van der Waals radius - null if not available
  
  See Also:
  
  Van de Waals radius
- electronegativity
```
public Double electronegativity()
```
  Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom or a functional group to attract electrons (or electron density) towards itself. This method provides access to the Pauling electronegativity value for a chemical element. If no value is available 'null' is returned.
  
  Returns:
  
  Pauling electronegativity - null if not available
  
  See Also:
  
  Pauling Electronegativity
- toIElement
```
public IElement toIElement()
```
  Access an IElement instance of the chemical element.
  
  Returns:
  
  an instance
- ofNumber
```
public static Elements ofNumber(int number)
```
  Obtain the element with the specified atomic number. If no element had the specified atomic number then Unknown is returned.
```
     // carbon
     Elements e = Elements.ofNumber(6);

     // oxygen
     Elements e = Elements.ofNumber(8);
 
```
  Parameters:
  
  number - atomic number
  
  Returns:
  
  an element, or Unknown
- ofString
```
public static Elements ofString(String str)
```
  Obtain the element with the specified symbol or name. If no element had the specified symbol or name then Unknown is returned. The input is case-insensitive.
```
     // carbon
     Elements e = Elements.ofString("c");
     Elements e = Elements.ofString("C");
     Elements e = Elements.ofString("Carbon");
     Elements e = Elements.ofString("carbon");
 
```
  Parameters:
  
  str - input string
  
  Returns:
  
  an element, or Unknown
- isMetal
```
public static boolean isMetal(int atno)
```
  Utility method to determine if an atomic number is a metal.
  
  Parameters:
  
  atno - atomic number
  
  Returns:
  
  the atomic number is a metal (or not)
- isMetal
```
public static boolean isMetal(IAtom atom)
```
  Utility method to determine if an atom is a metal.
  
  Parameters:
  
  atom - atom
  
  Returns:
  
  the atom is a metal (or not)

Enum Elements

Enum Constant Summary

Field Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

Unknown

Hydrogen

Helium

Lithium

Beryllium

Boron

Carbon

Nitrogen

Oxygen

Fluorine

Neon

Sodium

Magnesium

Aluminium

Silicon

Phosphorus

Sulfur

Chlorine

Argon

Potassium

Calcium

Scandium

Titanium

Vanadium

Chromium

Manganese

Iron

Cobalt

Nickel

Copper

Zinc

Gallium

Germanium

Arsenic

Selenium

Bromine

Krypton

Rubidium

Strontium

Yttrium

Zirconium

Niobium

Molybdenum

Technetium

Ruthenium

Rhodium

Palladium

Silver

Cadmium

Indium

Tin

Antimony

Tellurium

Iodine

Xenon

Caesium

Barium

Lanthanum

Cerium

Praseodymium

Neodymium

Promethium

Samarium

Europium

Gadolinium

Terbium

Dysprosium

Holmium

Erbium

Thulium

Ytterbium

Lutetium

Hafnium