1.

1 sodium 2 potassium 3 magnesium 4 aluminium

Answer»

Potassium, silicon and calcium belong to third period. For elements of same period size decreases while going from left to right in a period due to increase in Z-effective. Increase in Z-effective results in contraction of size. While going down the group, size of element increases due to addition of a shell. Thus, size of potassium is greater than that of sodium. So, potassium has the largest radius.



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