chemaxon.struc
Class PeriodicSystem

java.lang.Object
  chemaxon.struc.PeriodicSystem

public class PeriodicSystem

extends java.lang.Object

Periodic System of the Elements.

Version:

1.1, 08/23/2004

Author:

Gyorgy Pirok

Constructor Summary

PeriodicSystem()

Method Summary

static double	getAbundance(int z, int m) Natural abundance of the isotope
static int	getAtomicNumber(java.lang.String symbol) Returns the atomic number of the element specified by its symbol.
static int	getElementCount() Number of elements in the periodic system
static int	getIsotope(int z, int i) Retrieves an isotope of the element
static int	getIsotopeCount() Number of isotopes in the periodic system
static int	getIsotopeCount(int z) Number of isotopes of the element
static double	getMass(int z) Atomic weight of the element based on the natural abundance of its isotopes
static double	getMass(int z, int m) Atomic weight of the element
static int	getMostFrequentNaturalIsotope(int z) Returns the mass number of the most frequent natural isotope of the element
static java.lang.String	getName(int z) Name of the element
static java.lang.String	getSymbol(int z) Symbol of the element

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PeriodicSystem

public PeriodicSystem()

Method Detail

getElementCount

public static int getElementCount()

Number of elements in the periodic system

Returns:

number of element

getIsotopeCount

public static int getIsotopeCount()

Number of isotopes in the periodic system

Returns:

number of isotopes

getIsotopeCount

public static int getIsotopeCount(int z)

Number of isotopes of the element

Parameters:

z - atomic number of the element (protons)

Returns:

number of isotopes

getIsotope

public static int getIsotope(int z,
                             int i)

Retrieves an isotope of the element

Parameters:

z - atomic number of the element (protons)

i - index of the isotope (0 based)

Returns:

mass number of the isotope

getName

public static java.lang.String getName(int z)

Name of the element

Parameters:

z - atomic number (protons)

Returns:

element name

getSymbol

public static java.lang.String getSymbol(int z)

Symbol of the element

Parameters:

z - atomic number (protons)

Returns:

element symbol

getMass

public static double getMass(int z)

Atomic weight of the element based on the natural abundance of its isotopes

Parameters:

z - atomic number (protons)

Returns:

element symbol

getMass

public static double getMass(int z,
                             int m)

Atomic weight of the element

Parameters:

z - atomic number of the isotope

m - mass number of the isotope (0 for element mass)

Returns:

isotope mass (0 if isotope does not exist)

getAbundance

public static double getAbundance(int z,
                                  int m)

Natural abundance of the isotope

Parameters:

z - atomic number of the isotope (protons)

m - mass number of the isotope (protons + neutrons)

Returns:

natural abundance (100 for the most frequent isotope)

getMostFrequentNaturalIsotope

public static int getMostFrequentNaturalIsotope(int z)

Returns the mass number of the most frequent natural isotope of the element

Parameters:

z - atomic number (protons)

Returns:

mass number of the isotope (-1 if artifical element)

getAtomicNumber

public static int getAtomicNumber(java.lang.String symbol)

Returns the atomic number of the element specified by its symbol. Case insensitive.

Parameters:

symbol - atom symbol e.g. "C", "Br".

Returns:

atomic number or -1 if not found.