Question

How many electrons in K(potassium) have clockwise spin?

• A. 3
• B. 5
• C. 10
• D. 9

Answer 1

Answer: (C)

10

i) Electronic configuration of Na(11) is; $1s^{2}2s^{2}2p^{6}3s^1$. Therefore total no. of electrons with clockwise spin $=1+1+3+1=6$.

ii) Electronic configuration of K(19) is; $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3s^1$. Therefore total no. of electrons with clockwise spin $=1+1+3+1+3+1=10$.