Question

Determine the values of all the four quantum numbers of the 8^th electron in the O-atom and 15^th electron in Cl atom.

Answer 1

(1) O (Z = 8) 1s² 2s² 2p_x² 2p_y¹ 2p_z¹

Four quantum numbers for 2p_x¹ electron in oxygen atom:

n = principal quantum number = 2

l = azimuthal quantum number = 1

m = magnetic quantum number = +1

s = spin quantum number = `+1/2`

(2) Cl (Z = 17) 1s² 2s² 2p⁶ 3s² 3p_x² 3p_y² 3p_z¹

Four quantum numbers for 15^th electron in chlorine atom:

n = 3, l = 1, m = 0, s = `+1/2`

(3) Cr (Z = 24) 1s² 2s² 2p² 3s² 3p² 3d² 4s¹

n = 3, l = 2, m = +2, s = `+1/2`