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Week 5

The Periodic Table groups together elements with similar properties. In most Periodic Tables hydrogen is placed at the top of Group 1, but in some it is placed at the top of Group 7.

Using your knowledge of chemistry, comment on the reasons for hydrogen being placed above either Group 1 or Group 7.

Note same question for both year groups – but if answering from HIGHER must contain HIGHER knowledge (not Nat 5)