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Q.

In the lithium atom screening effect of valence shell electron is caused by

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a

electrons of K and L shell

b

electrons of K shell

c

Two electrons of 1st and one of 2nd shell

d

none

answer is B.

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Detailed Solution

Li(Z=3)...1s22s2only 1s2 electrons (K-shell electrons) causes screening effect
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In the lithium atom screening effect of valence shell electron is caused by