There are sub shells in shells around the nucleus.

(a) What is the maximum number of electrons that can be accommodated in d-sub shell ?

(b) Write the possible sub shells in 3rd shell in the increasing order of energy.

(c) Which of the following is the outermost electronic configuration of copper ?

(Atomic number = 29)

A : 3d9 4s2

B : 3d10 4s1

Justify your answer.

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1 Answers

(a) 10. 

(b) 3s < 3p < 3d. 

(c) B : 3d10 4s1 as completely filled orbitals are more stable

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