Post Utme Unilag 2017 Chemistry Question 21

Practice objective / multiple choice question 21 from the 2017 Post Utme Unilag Chemistry examination.

Post Utme Unilag 2017 Chemistry Objective / Multiple Choice
Question 21 POST_UTME_UNILAG • 2017 • CHEMISTRY • objective

The atomic radius of an element in the periodic table increases down a group and decreases across a period. What is the reason for this tr\end?

Answer Options

Correct Answer A. The atomic radius increases down a group due to the addition of new energy levels, while it decreases across a period due to the increase in effective nuclear charge.
B. The atomic radius decreases down a group due to the increase in effective nuclear charge, while it increases across a period due to the addition of new energy levels.
C. The atomic radius remains cons\tant down a group and across a period due to the equal number of protons and electrons.
D. The atomic radius increases down a group and across a period due to the increase in the number of protons.
Correct Answer
A
Correct Option:
The atomic radius increases down a group due to the addition of new energy levels, while it decreases across a period due to the increase in effective nuclear charge.

About This Question

This is Post Utme Unilag 2017 Chemistry Question 21. It is one of the objective questions from the 2017 Post Utme Unilag Chemistry examination.

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