Is hydrogen a group 1 element? Watch

Red_Inferno112
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#21
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#21
(Original post by Plato's Trousers)
exactly right. that's why they are called alkali metals.

(you could claim that chloric (I) acid is a group 7 hydroxide, I guess... but not an ionic one)
The problem is that acidity is based mainly around hydrogen itself and how many protons/hydroxide ions are formed. It's quite a core concept but not as fundamental as electron configs or properties of elements in general.
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Red_Inferno112
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#22
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(Original post by Plato's Trousers)
well, hydrogen can form covalent bonds (eg in water, methane etc). Alkali metals do not do this, so in this sense hydrogen is not in group 1

also, hydrogen can be reduced to form a negative ion (H-) in compounds like sodium hydride (NaH). The alkali metals cannot do this. In this sense, hydrogen is more like a halogen and so you could say it is in group 7

So, hydrogen is basically an anomaly. It doesn't really fit in any of the groups properly.
Alkali metals CAN form covalent bonds and even alkalides under certain conditions. There is a bigger jump between hydrogen and lithium than between lithium and sodium etc though I admit.
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