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around 11 for extension 2 from 2007 to 1997, all in exam conditions.... quite regretted the fact I started from 2006 and start doing it backwards...

I thought it was suppose to be a year-10 definition, so it should be kept simple as possible. Simply, Both are attractions between atoms. however, covalent bond is formed by the "sharing of electron(s) between two atoms" while ionic bond is formed by the "transfer of electron(s) from an atom...

Agree, though it really depends on how the others go in ext2 exam as well to find your grade in ext 2 maths. If one year, the paper is particularly hard, maybe 60% can grant you into E4. However, if everybody does well in the ext 2 exam, say,, the average is about 65%, the same mark (60%) would...