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Which of the following set of quantum nu...

Which of the following set of quantum numbers is possible for an electron in the ground state of an atom with atomic number 19?

A

n = 2, l = 0, m = 0

B

n = 2, l = 1, m = 0

C

n = 3, l = 1, m = -1

D

n = 3, l = 2, m = +2

Text Solution

Verified by Experts

The correct Answer is:
D
`K(Z=19):1s^(2), 2s^(2)2p^(6), 3s^(2)3p^(6), 4s^(1)`
In the ground state the value of l can be either zero or one. Hence, the set (d) of quantum numbers i.e., `(n=3, l=2, m=+2)` cannot possible in the ground state.
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