Question

Composition of the nuclei of two atomic species x and y are given as under
X Y
Protons 6 6
Neutrons 6 8

Answer 1

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X & Y both are the isotopes of Carbon.

X -> Carbon 12 (amu = 12)

Y -> Carbon 14 (amu = 14)

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Answer 2

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Mass number of X = Number of protons + Number of neutrons

= 6 + 6

= 12

Mass number of Y = Number of protons + Number of neutrons

= 6 + 8

= 14

These two atomic species X and Y have the same atomic number, but different mass numbers. Hence, they are isotopes.

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