1.

Composition of the nuclei of two atomic species X and Y are given as under : X Y Protons = 66 Neutrons= 68 Give the mass numbers of X and Y. What is the relation between the two species ?

Answer»

SOLUTION :Mass number = number of protons + neutrons
Mass number of X = 6+6 = 12
Mass number of Y = 6 + 8 = 14
The atomic number of both X and Y is the same, 1.e., 6.
`therefore` X and Y are the ISOTOPES of the same ELEMENT.


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