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Which of the following statements are true for the electronic configuration of magnesium? I: The 2s...

Which of the following statements are true for the electronic configuration of magnesium?

I: The 2s electrons are more difficult to remove than the 3s electrons

II: The 2s electrons efficiently shield the 3s electrons from nuclear charge

III: The 2s electrons feel a higher effective nuclear charge than the 3s electrons

(1) Only I

(2) Only III

(3) I and II

(4) II and III

(5) I, II, and III

Answer is (5) please explain

Science   Chemistry   
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Answer #1

Yes you are right, answer is option 5, since 2s electrons are near to the nucleus than 3s electrons and binds to the nucleus very strongly than 3s electrons. Hence to remove the these needs more energy.

Secondly attractions between 3s electrons and nucleus are shield by 2s electrons which are in between the nucleus and 3s shell.

Because of near to nucleus, attraction towards nucleus is more. Hence nuclear charge effect is more.

Thirdly, it is a/c to Slater formula for effective nuclear charge

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