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

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Composition of the nuclei of two atomic species X and Y are given as under

X           Y

Protons =        6           6

Neutrons =      6           8

Give the mass numbers of X and Y. What is the relation between the two species?

by (128k points)

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.