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qa. these isoptopes have identical chemical properties becoz they have the same number of protons and electrons .As we all know that chemical properties of an element is mostly depend on the electrons .
qb. they are neutral because they have equal number of protons and electrons in their respective atoms,as a result they cancel out their charges. Therefore they are neutral.
qc. they have different masses because they have different number of neutrons respectively. As we all know that mass number = no of protons + no of neutrons. Matlab number of neutrons mai change hone se mass number mai bhi change aiga .
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