Question

define istopes,isobars and isotones with 3 examples of each

Answer 1

Isotopes-atoms of the same element having same atomic number but different mass number.
Examples:-Isotopes of hydrogen
Protium (Z=1,A=1)
Deuterium (Z=1,A=2)
Tritium (Z=1,A=3)

Isobars-atoms of different elements having same atomic mass but different atomic number.
Examples:-S, Cl, Ar, K.All these have different atomic number but same atomic mass that is 40.

Isotones- elements having same number of neutrons but different number of protons.
Examples:-Ar, K, and Ca are isotones because they all have 20 number of neutrons but different number of protons.