Chemistry · Oct / Nov 2018 · Paper 11 · Question 25
5070Metallic bonding
The melting point of lithium is 181 °C. The melting point of sodium is 98 °C. Which statement explains why lithium has a higher melting point than sodium?
- ALithium has more valency electrons than sodium.
- BSodium is more reactive than lithium.
- CSodium is softer than lithium.
- DThe attraction between the positive ions and the ‘sea of electrons’ is stronger in lithium than in sodium.
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Correct answer: D. The attraction between the positive ions and the ‘sea of electrons’ is stronger in lithium than in sodium.
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