JAMB Chemistry 2016 Objective — Question 40

Question 40 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2016 Objective paper, with the correct answer and a full explanation.

40. The number of electronic shells contained in an atom with electron configuration 1s²2s²2p⁶3s²3p⁶4s² is A. 3 B. 2 C. 4 D. 5

A. 3
B. 2
C. 4Correct
D. 5

Explanation

1s2 2s2 2p6 3s2 3p6 4s2 = 20 electrons. The K, L, M, N shells structure will go as: 2, 8, 8, 2. Thus, the element has four shells.

Sign up free to unlock

Score tracking
Practice history
Saved questions
Progress dashboard
Personalized sessions
Weak-topic breakdown

…and/or go further with premium services and No Ads.

Create free account

More questions from Chemistry 2016 Objective More Chemistry past papers