Question

*Which of these atoms has smallest atomic radious? ₁₁Na, ₁₅K, ₁₇Cl, ₁₄Si*

1️⃣ ₁₄Si
2️⃣ ₁₇Cl
3️⃣ ₁₅K
4️⃣ ₁₁Na
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Answer 1

Answer:

All given elements are present in second and third periods. The atomic size decreases towards the right in a period as effective nuclear charge increases. Down the group size increases due to addition of a new shell.

Thus the order of size is Na>Mg>B>N.

Hence the smallest is N (Nitrogen).

Answer 2

All given elements are present in second and third periods. The atomic size decreases towards the right in a period as effective nuclear charge increases. Down the group size increases due to addition of a new shell.

Thus the order of size is Na>Mg>B>N.

Hence the smallest is N (Nitrogen).