JAMB Chemistry 2020 Objective — Question 4

Question 4 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.

4. Which of the following decreases across the period?

A. A. Electronegativity
B. B. Atomic radiusCorrect
C. C. Metallic character
D. D. Ionization energy

Explanation

Electronegativity, ionization energy and electron affinity all increase across a period, while atomic radius and metallic character decrease across a period due to increasing effective nuclear charge. Since the question asks for one option, atomic radius is the standard answer.

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