The Sblock Elements Ques 36

36. Which of the following atoms will have the smallest size?

[1989]

(a) $Mg$

(c) $Be$

(b) $Na$

(d) $Li$

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Answer:

Correct Answer: 36.(c)

Solution:

(c) Within a period, the atomic size decreases from left to right.Further atomic size increases down the group. Hence the correct order is

$ \text{ i.e. } Na>Mg>Li>Be \text{. } $