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Head Elements (Group 1)

The single-bo...

Question

The single-bonded metallic radius of Na is 157 pm. What is the reasonable estimate of the radius of Na assuming that the increment between radii of different magnitudes is 60 pm?

97 pm

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95 pm

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93 pm

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99 pm

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Solution

The correct option is A 97 pm
The metalllic radius is always greater than the cationic radius.
The metallic radius is 157 pm and the increment between radii of different magnitudes is 60 pm.
Hence, the cationic radius of Na is $157 p m - 60 p m = 97 p m$

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