Question

Which of the following quantum numbers are correct for the outermost electron of sodium atom?

• A. n = 4, l = 0, m = 0, s = + 1/2
• B. n = 3, l =0, m = 0, s = - 1/2
• C. n = 3, l = 1, m = + 1, s = + 1/2
• D. n = 3, l = 2, m = - 1, s = - ½

Answer 1

Answer: (B)

n = 3, l =0, m = 0, s = - 1/2

Answer 2

: $11Na = 1s^{2}2s^{2}2p^{6}3s^{1}$

For $3s^{1},n = 3,l = 0,m_{l} = 0,s = - 1/2$