19K, 3li, 11Na, 4Be Which of these atoms has smallest atomic radius?

Question

Write down the electronic configuration of the following elements from the given atomic numbers. Answer the following question with explanation.

f. ₁₉K, ₃li, ₁₁Na, ₄Be Which of these atoms has smallest atomic radius?

Answer 1

Elements	Electronic configuration
(i) 19K	2, 8, 8, 1
(ii) 3Li	2, 1
(iii) 11Na	2, 8, 1
(iv) 4Be	2, 2

₄Be has smallest atomic radius.