A) 0.72, 0.71
B) 0.72, 1.6
C) 1.6, 1.58
D) 0.71, 0.72
Correct Answer: B
Solution :
Key Idea Ne 15 monoatomic gas so their covalent radii cannot found out. Atomic radii decrease in a period from left to right hence, fluorine has a very less atomic radii (covalent atomic radii = 0.72 \[\overset{o}{\mathop{A}}\,\]) but in the noble gases (as in Ne) there is no covalent bond formation because these gases are monoatomic in nature. In the noble gases, their calculated atomic radii is the van der Waals radii which is found almost double to covalent radii hence, there is a high jump in the value of radius from F (0.72 \[\overset{o}{\mathop{A}}\,\]) to Ne (1.6\[\overset{o}{\mathop{A}}\,\]).
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