Ncert Exercises & Solutions

Match the elements given in List-I with the atomic radius given in List-II the correct atomic radius with the corresponding element.

	List-I Element		List-II Atomic radius (pm)
A.	Be	i.	74
B.	C	ii.	85
C.	O	iii.	112
D.	B	iv.	77
E.	N	v.	66

Options:	A	B	C	D	E
1.	i	ii	iii	iv	v
2.	iii	iv	v	ii	i
3.	iv	ii	iii	i	v
4.	v	ii	i	iii	iv

Hint: Left to right size decreases and top to bottom it is increases

Across the period left to right atomic size decreases because the effective nuclear charge is increases. All given elements in the order of their atomic size is as follows:

Be > B >C > N > O

Hence, option second is the correct answer

Be	112
B	85
C	77
N	74
O	66

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