SATHEE: Atomic Structure Question 243

Atomic Structure Question 243

Question: The electronic configuration of copper $(_{29} C u)$ is

[DPMT 1983; BHU 1980; AFMC 1981; CBSE PMT 1991; MP PMT 1995]

Options:

A) $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{9}, 4 s^{2}$

B) $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}, 4 s^{1}$

C) $1 s^{2} .2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}, 4 s^{2} 4 p^{6}$

D) $1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6} 3 d^{10}$

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Answer:

Correct Answer: B

Solution:

3d subshell filled with 5 electrons (half-filled) is more stable than that filled with 4 electrons. $1,, 4 s$ electrons jumps into $3 d$ subshell for more sability.

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Atomic Structure Question 243

Question: The electronic configuration of copper (29Cu) is

Options:

Answer:

Solution:

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Question: The electronic configuration of copper $(_{29} C u)$ is