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प्रश्न
The atomic radii of first group elements are given below:
| Group - I element | Atomic Radii (pm) |
| Na | 86 |
| K | 231 |
| Rb | 244 |
| Cs | 282 |
State the reason behind the observed trend in the above elements.
कारण बताइए
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उत्तर
There are more shells in a group as we go from top to bottom. As a result, the atomic radius grows.
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