Q

Composition of the nuclei of two atomic species X and Y are given as under, Give the mass numbers of X and Y . What is the relation between the two species?

Q. 13.     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?

Views

As we know,

the mass number of an atom = No. of protons + No. of Neutrons

So,

The mass number of X = No. of protons of X  + No. of Neutrons of X

= 6 + 6

= 12

The mass number of Y = No. of protons of Y  + No. of Neutrons of Y

= 6 + 8

= 14

As both X and Y have the same atomic number (6) but different numbers (i.e., 12 and 14 respectively),  they are isotopes.

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