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If the differ...

Question

If the difference in atomic size of $N a - L i = x, R b - K = y, F r - C s = z$ .
The correct order will be :

A

x = y = z

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B

x > y > z

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C

x < y < z

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D

x < y << z

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Solution

The correct option is B $x > y > z$
The atomic size of alkali metals is given below.
Element
Li
Na
K
Rb
Cs
Fr
Atomic size (pm):
152
186
227
248
265
270

$x = 186 - 152 = 34 p m$
$y = 248 - 227 = 21 p m$
$x = 280 - 265 = 5 p m$
The correct order will be $x > y > z$ .

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