The elements of group I are called the alkali metals because they
Correct answer: B. react with water to form hydroxides that are strongly basic
- A. are found free in nature
- B. react with water to form hydroxides that are strongly basic
- C. are all radioactive
- D. form acidic oxides
Explanation
Sodium and its neighbours react with water to give hydrogen and a hydroxide solution that is strongly alkaline, which is the origin of the family name. Because they are so reactive they are never found uncombined in nature and are stored under oil. Their oxides are basic, not acidic, which is typical of metals.
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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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