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Question

Which of the following boxes contains isotones? (Numbers in the box represents mass number)


A

Box A

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B

Box B

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C

Box C

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D

None of these

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Solution

The correct option is C

Box C


Isotopes - One of two or more atoms having the same atomic number but different mass numbers.

Cobalt=55, Cobalt=56, Cobalt=57 (each has 27 protons).

Isobar - Any of two or more kinds of atoms having the same atomic mass but a different atomic number.

Manganese-56, Iron-56, Cobalt-56

Isotones - One of two or more atoms whose nuclei have the same number of neutrons but different numbers of protons.

Manganese-56, Iron-57, Cobalt-58 (31 neutrons each).


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