JAMB Chemistry 2021 Objective — Question 36

Question 36 of 41 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2021 Objective paper, with the correct answer and a full explanation.

Which of the following statements is correct? (a) Atomic size decreases down the group (b) Cations are smaller than the parent atoms (c) Anions are larger than the parent atoms (d) Atomic size increases across the period

A. Atomic size decreases down the group
B. Cations are smaller than the parent atoms
C. Anions are larger than the parent atomsCorrect
D. Atomic size increases across the period

Explanation

Anions gain electrons → increased electron-electron repulsion → larger radius than parent atom. Cations lose electrons → smaller radius. Atomic size increases DOWN the group (more shells). Atomic size decreases ACROSS the period.

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