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| Q. |
In the periodic table of elements, on moving from left to right across a period, the atomic radius – |
| A. | decreases |
| B. | increases |
| C. | remains unchanged |
| D. | does not follow a definite pattern |
| Answer» A. decreases | |
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Explanation: The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbital in an atom that is at equilibrium. It tends to decrease across a period from left to right. It usually increases while going down a group due to the addition of a new energy level (shell). |
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