Which of the following property increases down the group in alkali metals?
Correct answer: B. Reactivity
- A. Ionization energy
- B. Reactivity
- C. Electron affinity
- D. Electronegativity
Explanation
The reactivity of alkali metals increases as you go down the group because: the atoms get larger as you go down the group. the outer electron gets further from the nucleus as you go down the group.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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