How does effective nuclear charge effect size?


In Periodic Table

Across a period, effective nuclear charge increases as electron shielding remain constant. A higher effective nuclear charge causes greater attractions to the electrons, pulling the electron cloud closer to the nucleus which results in a smaller atomic radius. 

Down the group, Effective nuclear charge decreases. This causes fewer attractions to electrons which results in a larger atomic radius. So the size of the atom increases.

Updated on: 10-Oct-2022

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