Question

Explain why the atomic radius decreases across a period and increases down a group ?​

Answer 1

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In general, atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant. ... Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital..

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Answer 2

Answer:

across a period the electron is increased causing decrease in the atomic radius

while going doun in a group a shell is added causing an increase in the atomic radius

hope it helped you