Question

which has a higher sheilding effect Na or K

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Answer 1

Answer:

K has higher shielding effect.

Explanation:

K has more electron shielding on its outermost electron than Na. The electronic configuration of them are:

Na - 1s2 2s2 2p6 3s1.

K - 1s2 2s2 2p6 3s2 3p6 4s1

In Na, the outermost electron 3s1 is being attracted by its nucleus. Apart from this attraction force, it’s experiencing a repulsive force from the electrons between the nucleus and itself. That is the electrons from 1s 2s and 2p are repulsing the electron in 3s. Here, 10 electrons are repulsing the outermost electron.

In K, the same thing occurs. That is, the electron in 4s is repealed by electrons from 1s 2s 2p 3s and 3p. Here, 18 electrons are repulsing the outermost electron in 4s.

As the charge of all electrons are equal, the repulsive force exerted by each of them is also going to be equal. So, as K has more electrons repulsing its valence electron than Na, it has greater electron shielding.

Hope this helps!