Question

P, Mg, Na, Cl (In increasing order of atomic size)

Answer 1

Answer:

Explanation: The atomic radii decrease on moving from left to right in a period, thus order of sizes for Cl, P and Mg is Cl < P < Mg. Down the group size increases. Thus overall order is : Cl < P < Mg < Ca.

Explanation:

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Answer 2

Answer:

The order of increasing atomic size: Cl , P ,Mg, Na.

Explanation:

The size decreases when we move across the group. Na being on the extreme left has the biggest atomic size followed by Mg, P and then Cl has the smallest size among the four.

Across the period the electron shielding remains constant but effective nuclear charge increases. Due to a high effective nuclear charge it attracts the electrons more , pulling the electrons closer. This result in the reduction of atomic size.

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