Carbonates of lithium are not stable like that of sodium due to________________?
Correct answer: B. Low electropositivity
- A. Low electronegativity
- B. Low electropositivity
- C. Low charge density
- D. Not known yet
Explanation
Lithium ion has a small size and high charge density, so it strongly polarizes the carbonate ion and makes Li2CO3 less stable on heating than Na2CO3. Lithium carbonate decomposes more readily to Li2O and CO2. Students may choose a by linking stability to electronegativity, but the important factor is lithium's low electropositivity and strong polarizing power.
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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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