CAIE A Level Chemistry 9701 · Chemical bonding
In a piece of solid zinc, each atom releases two electrons into a shared sea of delocalised electrons; in solid sodium, each atom releases one electron. The ionic radius of is 0.074 nm and that of is 0.102 nm.
Compare the metallic bonding in solid zinc with that in solid sodium.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Compare means: Give similarities or differences between two things, and say which side each point belongs to. Write each point as a pair, for example: A is X, whereas B is Y. Two separate descriptions rarely earn the marks.
Written by Markquill to follow the Cambridge International syllabus. Markquill is independent and is not affiliated with or endorsed by Cambridge International.