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The mass numbers and atomic numbers of some atoms are given in the following table.
Atom A B C D E
Mass No. 2 3 3 9 19
Atomic No. 1 1 2 4 9
Among the given elements, which element(s) represent isobars?

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D and E

A and B

A and C

B and C

answer is B.

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Detailed Solution

Elements B and C represent isobars.

The atoms of different elements having the same mass number (or atomic mass) but different atomic numbers are called isobars. Elements B and C have the same mass number but different atomic numbers, thus these are isobars.

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