passwella.
Menu

JAMB Chemistry 1991 Question 11

Question 11

Atomic Structure

The electronic configuration of an element is 1s22s22p63s23p3. How many unpaired electrons are there in the element?

  1. A.5
  2. B.4
  3. C.3
  4. D.2.
Show the answer and explanation

Answer: C (3)

Explanation

The three 3p electrons go one into each of the three p orbitals (Hund's rule), so there are 3 unpaired electrons.