Answer:
(a) Isotopes are A and C because they have same number of
protons but different number of neutrons.
(b) Isobars are B and C because they have same mass numbers,
but different number of protons Mass number of B = Number of protons + Number
of neutrons.
= 7 + 7 = 14
Mass number of C = 6 + 8 = 14
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