WAEC Chemistry 2025 Objective — Question 18

Question 18 of 50 from the West African Examinations Council (WAEC) Chemistry 2025 Objective paper, with the correct answer and a full explanation.

Alkali metals are good conductors of heat and electricity because they

A. contain delocalized electronsCorrect
B. are found in the d-block
C. have vibrating ions
D. are all metals

Explanation

Alkali metals (like sodium and potassium) are good conductors of heat and electricity because they have delocalized electrons that are free to move throughout the metallic structure, allowing them to transfer energy efficiently.

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