Question

Which of the following elements has the
largest atomic radii?
(a) Ca (b) Na (c) Mg (d) K​

Answer 1

potassium because no. of shells in potassium is greater than mg and na however it is equal in calcium but since calcium has more electrons than magnesium therefore the outermost shell of calcium will be attracted more and thus leading to decrease in atomic raidius

Answer 2

Explanation:

Atomic radii

Ca = 194 pm

Na= 190 pm

Mg = 145 pm

K = 243 pm

so K has largest radii

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