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1. Identify isotopes and isobars:​

Answer»

:-Explanation :-Reason: Isobars are the atoms of different elements having different atomic number but same MASS number. So, are isobars.Here, has,Atomic number = 20Mass number = 40AND, has,Atomic number = 18Mass number = 40Hence, they are having same atomic number. So, it is an isobar.Reason: Isotopes are the atoms of same ELEMENT having same atomic number but different mass number. Hence, are isotopes.Here, has,Atomic number = 20Mass number = 40And, has,Atomic number = 20Mass number = 39Hence, they are having same atomic number. So, it is a isotope.



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