JAMB Chemistry 2019 Objective — Question 2

Question 2 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

Which of the following represents the correct order of increasing atomic radius?

A. Na, Mg, Al, Si, P
B. Na, Si, Mg, Al, P
C. P, Si, Al, Mg, NaCorrect
D. P, Mg, Si, Al, Na

Explanation

Atomic radius decreases across a period (left to right) and increases down a group. Since Na, Mg, Al, Si, P are all in period 3, moving across the period P→Si→Al→Mg→Na, atomic radius increases — this is the order of increasing atomic radius.

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