Question

what is isotope and what is isobar give difference between them and give a trick to learn them

Answer 1

the atoms of the same element which have the same number of protons but have different number of neutrons are called isotopes.

Answer 2

isotope :- a group of elements in which mass number are different but atomic numbers are same .
ex:- C have to isotope C12 and C 14

isobar:- a group of elements in which their mass numbers are same but atomic numbers are different .
ex:- Ar , Ca are isobar elements
because their mass is 40u but atomic numbers are 18, 20 respectively .