Slater's rules are applied to the single valence $s$ electron of the alkali metals Li, Na, K and Rb. Which statements are correct?

Answer: A, D

Li:

S = 2 (0.85) = 1.70

Z^{*} = 1.30

. Na:

S = 8 (0.85) + 2 = 8.80

Z^{*} = 2.20

. K:

S = 8 (0.85) + 10 = 16.80

Z^{*} = 2.20

. Rb:

S = 8 (0.85) + 28 = 34.80

Z^{*} = 2.20

. So Na, K and Rb are equal, and Li is the lowest.

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