Which one of the following set of quantum numbers is not possible for electron in the ground state of an atom with atomic number 19?

Question

Which one of the following set of quantum numbers is not possible for electron in the ground state of an atom with atomic number 19? (A)  n=2,l=0, text m=0  (B)  n=2,l=1,m=0  (C)  n=3,l=1,m=-1  (D)  n=3,l=2, text m=+2

Tardigrade Admin · Accepted Answer

K(Z=19): text 1s2, text 2s22p6,3s23p6,4s1 In the ground state the value of I can be either zero or one. Hence, the set (d) of quantum numbers i.e., (n=3, text Z=2,m=+2) cannot possible in the ground state.

Q. Which one of the following set of quantum numbers is not possible for electron in the ground state of an atom with atomic number 19?

$n = 2, l = 0, m = 0$

$n = 2, l = 1, m = 0$

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

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

$n = 4, l = 0, m = 0$

$K (Z = 19) : 1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{6}, 4 s^{1}$ In the ground state the value of I can be either zero or one. Hence, the set (d) of quantum numbers i.e., $(n = 3, Z = 2, m = + 2)$ cannot possible in the ground state.

Q. Which one of the following set of quantum numbers is not possible for electron in the ground state of an atom with atomic number 19?

n=2,l=0,m=0

n=2,l=1,m=0

n=3,l=1,m=−1

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

n=4,l=0,m=0