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ISOTOPES

ISOTOPES 
The atoms of the same element having same atomic number but different atomic masses are called isotopes.
  • Isotopes of an element are chemically identical but physically different from each other.
  • They were discovered by Soddy.
Similarities and differences between isotopes of an element 
Classification of elements on the basis of number of isotopes:
Elements are classified as mono isotopic and poly isotopic as discussed below:
Mono isotopic elements:
The elements having only one isotope are called mono isotopic elements.
Example: Fluorine, iodine, arsenic, gold, sodium etc.
Poly isotopic elements:
The elements having two or more isotopes are called poly isotopic elements.
Examples:
  • Nitrogen has three isotopes. 
  • Hydrogen has three isotopes.
  • Carbon has three isotopes. 
  • Oxygen has three isotopes. 
  • Sulphur has four isotopes.
  • Nickel has five isotopes.
  • Calcium and palladium has six isotopes each.
  • Cadmium has nine isotopes.
  • Tin has eleven isotopes.
  • Silver has sixteen isotopes.

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