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How does atomic radius vary in a period ...

How does atomic radius vary in a period and in a group? How do you explain the variation?

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In a period: Atomic radius decreases generally from left to right in a period
Reason: In periods electrons are entered into same subshells.
In a group: Atomic radius increases generally from top to bottom in a group.
Reason: In groups electrons are entered into new subshells.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-Very Short Answer Questions
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