2.1 Two atoms are said to be isobars if.
(a) they have same atomic number but different mass number
(b) they have same number of electron but different number of neutrons.
(c)they have same number of neutrons but different number number of electron.
(d) sum of the number of protons and neutrons is same but the number of protons is different.
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Answer:
OPTION 4
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