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?
| $X$ | $Y$ | |
| Protons $=$ | $6$ | $6$ |
| Neutrons $=$ | $6$ | $8$ |
Give the mass numbers of $X$ and $Y$. What is the relation between the two species?
(D) Mass number of $X = \text{Number of protons} + \text{Number of neutrons} = 6 + 6 = 12$.
Mass number of $Y = \text{Number of protons} + \text{Number of neutrons} = 6 + 8 = 14$.
These two atomic species $X$ and $Y$ have the same atomic number (number of protons $= 6$),but different mass numbers ($12$ and $14$). Hence,they are isotopes.
Mass number of $Y = \text{Number of protons} + \text{Number of neutrons} = 6 + 8 = 14$.
These two atomic species $X$ and $Y$ have the same atomic number (number of protons $= 6$),but different mass numbers ($12$ and $14$). Hence,they are isotopes.
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