jamesolukanmi
Answered

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across the period the size of an atom decreases and effective nuclear charge​

Sagot :

DrippQueenMo

Answer:

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.

Explanation:

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