Question

name the element having smallest and largest atomic radii of any of the above three elements. Give reoson for your answer.

Answer 1

Answer:

Atomic size decreases across a Period, and increases down a Group. Between Na, Mg, and Be, sodium should have greatest atomic size.

Explanation:

Given that atomic size decreases across a Period, the sodium atom is larger than that of magnesium. Both third row metals are larger than second row beryllium, inasmuch as the third Period metals build on the atomic radius (the electron shell) already possessed by the second Period.

Answer 2

Explanation:

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