Why atomic size increases in a group but decreases in a period ?I want

1.	Why atomic size increases in a group but decreases in a period ?I want a brief explanation....
Answer» HOLA MATE HERE IS UR ANSWER ♥♥♥♥ Electron shielding prevents these outer ELECTRONS from being attracted to the nucleus; thus, they are LOOSELY held, and the RESULTING atomic radius is large. Atomic radius decreases from left to right within a period. This is caused by the increase in the number of protons and electrons across aperiod. This results in a DECREASE in atomic radii across the Period, due to the INCREASED nuclear charge which draws in the valence electrons. On the other hand, going down a Group, we GO to another so-called shell of electrons, that build on the preceding shell. Atomic radii thus INCREASE down the Group. HOPE IT HELPS U ♥♥

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