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Q.

In which of the following pair difference in Zeff  is 0.65 ?

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a

C, Si

b

C, O

c

Mg, Al

d

Ca, Sr

answer is C.

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Detailed Solution

For 3rd period elements Zeff  difference between any two successive elements is 0.65
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In which of the following pair difference in Zeff  is 0.65 ?