Mark the correct statement.

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(A) The correct statement is that nuclei of different elements can have the same number of neutrons. These are known as isotones.For example,consider

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Nuclei of different elements can have the same number of neutrons.

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(A) The correct statement is that nuclei of different elements can have the same number of neutrons. These are known as isotones.For example,consider $_4Be^9$ and $_5B^{10}$.For $_4Be^9$: Number of neutrons $N = A - Z = 9 - 4 = 5$.For $_5B^{10}$: Number of neutrons $N = A - Z = 10 - 5 = 5$.Since both have $5$ neutrons,they are isotones.

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