JAMB Chemistry 2025 Objective — Question 14

Question 14 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2025 Objective paper, with the correct answer and a full explanation.

Atomic radius decreases across a period because

A. Electron shielding increases
B. Nuclear charge increases while electrons are added to the same energy levelCorrect
C. The number of electron shells decreases
D. Nuclear charge decreases

Explanation

Across a period, protons are added to the nucleus (increasing nuclear charge) while electrons fill the same outer shell. The greater effective nuclear charge pulls electrons closer, decreasing atomic radius.

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