Reason for alkali metals to be soft is that
Correct answer: C. They do not having tightly packed structures
- A. They are less metallic in nature
- B. There is only one valency
- C. They do not having tightly packed structures
- D. They have high IE
Explanation
Alkali metals are soft because of their large atomic size and single valence electron, leading to weaker metallic bonds between atoms. This results in a less tightly packed structure and softer texture. The other options are incorrect because they do not address the specific atomic properties that contribute to the softness of alkali 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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