Chemistry Open Ended Watch

gw07mcgheerachel
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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 why hydrogen can be
placed at the top of Group 1 and Group 7.

Could anyone give me a rough idea of what I'd talk about to get the 3 marks?
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username3998598
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The fact that it can either bond ionically with a metal in ionic bonding, and lose its electron forming an H+ ion means that it could be placed in group one. However it can also do covalent bonding with non metals, sharing its one electron with another atom to achieve its full outer shell - this would merit it a place in group 7.
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