WAEC Chemistry 2022 Objective — Question 36

Question 36 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.

Ionization energy increases across the period in the periodic table because

A. atomic number increases
B. effective nuclear charge increasesCorrect
C. mass number increases
D. screening effect decreases

Explanation

Across a period, the effective nuclear charge increases (more protons with the same shielding shell), pulling electrons more strongly and increasing ionization energy.

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