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Q.

The value of $Z_{eff}$ for ${Li}^{+}$ is .x and the value of $Z_{eff}$ for $H$ - atom is y then value of (.x + y) is :

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a

3.4

b

none of these

c

3.7

d

2.32

answer is B.

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Detailed Solution

For ${Li}^{+}$ ,

$\begin{array}{l} {Li}^{+} \to 1 s^{2} \\ σ = 1 \times 0.30 \\ Z_{e f f} = 3 - 0.30 = 2.7 \\ H \to 1 s^{1} \\ Z_{e f f} = 1 \end{array}$

So the value of (.x + y) is,

$x + y = 2.7 + 1 x + y = 3.7$

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