what are isotopes,isobars and isotones?????

Hi Anamika,
This query is quite obvious among students of your grade. Well, the answer is as follows:
Isotopes - Isotopes are the elements having same atomic number but different mass number.For e.g.C12 and C13
Isobars - Isobars are the elements having same mass number but different atomic number. For e.g K19 and Ca20
Isotones - Isotones are the elements having same number of neutrons but different number of protons.For e.g. Cl37, Ar38
 
Hope this answer will help you.
Cheers!

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