In many of its properties _ is quite different from the other alkali metals.
Correct answer: A. Li
- A. Li
- B. Be
- C. Na
- D. K
Explanation
Lithium is harder than other alkali metals. The melting and boiling point is higher than other alkali metals. Out of all the other alkali metals, it is the least reactive metal.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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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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