passwella.
Menu

JAMB Chemistry 2005 Question 35

Question 35

Atomic Structure

What is the valence shell electron configuration of the element with atomic number 17?

  1. A.1s22s22p63s23p4
  2. B.1s22s22p63s23p5
  3. C.2s22p6
  4. D.3s23p5
Show the answer and explanation

Answer: D (3s23p5)

Explanation

Element 17 (chlorine) is 1s22s22p63s23p5; its valence shell is the third shell, 3s23p5 (7 electrons).