WAEC Chemistry 2020 Objective — Question 10
Question 10 of 50 from the West African Examinations Council (WAEC) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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Which of the following pairs of properties of alkali metals decreases down the group? A. First ionization energy and reactivity B. Melting point and atomic radius C. Reactivity and electronegativity D. First ionization energy and melting point
- A. First ionization energy and reactivity
- B. Melting point and atomic radius
- C. Reactivity and electronegativity
- D. First ionization energy and melting pointCorrect
Explanation
Down the group, first ionization energy, electronegativity and electron affinity decrease, while atomic radius, ionic radius and metallic character increase.
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