In the context of periodicity, a unit called picometre is used to measure the __________.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. atomic radius.
In the context of periodicity, a unit called picometre is used to measure the atomic radius. A picometre (pm) is one trillionth of a metre (10⁻¹² metres) and is commonly used to describe the size of atoms. As atomic radii vary across periods and groups in the periodic table, picometres provide a precise measurement of how atoms change in size due to electronic configurations and periodic trends.