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4. STRUCTURE OF THE ATOM
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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 ?
Option A
Option B
Option C
Option D
Solution
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.
Standard 9
Science
