The correct order of atomic radius of Li, Na, Be and O is (a) Na > Li > Be > O (b) Na > Be > Li > O (c) Be > Li > Na > O (d) O > Be > Li > Na

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Q: 119 (CDS-I/2024)
The correct order of atomic radius of Li, Na, Be and O is
(a) Na > Li > Be > O
(b) Na > Be > Li > O
(c) Be > Li > Na > O
(d) O > Be > Li > Na

question_subject: 

Science

question_exam: 

CDS-I

Atomic radius generally increases down a group and decreases across a period. Sodium (Na) is larger than Lithium (Li) because it is further down the group. Both are larger than Beryllium (Be) and Oxygen (O), which are in a smaller period. Oxygen has the smallest radius.