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How many electron in copper atom (.(29)C...

How many electron in copper atom `(._(29)Cu)` have `(n+l) = 4`

A

6

B

7

C

8

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
`._(29)Cu` is `1s^(2)2s^(2)2p^(6) 3s^(2) 3p^(6)3d^(10) 4s^(1)`. The electrons having (n+l) = 4 are present in 3p and 4s shells. Hence total number of such electrons is 7.
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