Question

Why is the size of sodium
is greater than magnesium ?​

Answer 1

Answer:

Since atomic number of magnesium is more than sodium but the numbers of shells are same, the nuclear pull is more in case of Mg atom. Hence its size is smaller than sodium.

Explanation:

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Answer 2

Explanation:

Since atomic number of megansium is more than sodium but the number of shells are same ,the nuclear pull is more in case of Mg atom hence its size smaller than sodium.