QuestionJanuary 3, 2026

Which of the following ranks the atoms from smallest radius to largest radius? Nalt Mglt K Mglt Klt Na Mglt Nalt K Klt Nalt Mg

Which of the following ranks the atoms from smallest radius to largest radius? Nalt Mglt K Mglt Klt Na Mglt Nalt K Klt Nalt Mg
Which of the following ranks the atoms from smallest radius to largest radius? Nalt Mglt K Mglt Klt Na Mglt Nalt K Klt Nalt Mg

Solution
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Answer

Mg\lt Na\lt K Explanation 1. Compare atomic radii trends in the periodic table Atomic radius increases down a group and decreases across a period (left to right). 2. Determine relative positions of Na, Mg, and K Mg is in Period 3, Group 2; Na in Period 3, Group 1; K in Period 4, Group 1. Radius order: smallest is Mg (rightmost), then Na (same period but left), largest is K (lower period). 3. Rank from smallest to largest Order: Mg < Na < K.

Explanation

1. Compare atomic radii trends in the periodic table <br /> Atomic radius increases down a group and decreases across a period (left to right). <br /><br />2. Determine relative positions of Na, Mg, and K <br /> Mg is in Period 3, Group 2; Na in Period 3, Group 1; K in Period 4, Group 1. Radius order: smallest is Mg (rightmost), then Na (same period but left), largest is K (lower period). <br /><br />3. Rank from smallest to largest <br /> Order: $Mg < Na < K$.
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