Li is different from its family members due to____________________?
Correct answer: D. all of the above
- A. small size
- B. high charge density
- C. less electropositivity
- D. all of the above
Explanation
Lithium differs from the other alkali metals because its atom and ion are unusually small, giving Li+ a high charge density; it is also less electropositive. These properties cause anomalous behaviour in compounds such as Li2CO3 and LiF. Students may choose only a or b when they identify one reason but overlook that all three listed properties contribute.
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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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