Chemistry - Electron configuration and periodic classification: hydrogen
Electron configuration and periodic classification: hydrogen and helium
The location of hydrogen in the periodic table is often a matter of
debate. With the electron configuration 1s, it has one outer-shell electron
and can therefore be located in group I. Its ability to lose one electron
and become an H ion is certainly consistent with the behaviour of the rest
of group I.
But a hydrogen atom can also form a single covalent bond with another
hydrogen atom. This behaviour is consistent with the behaviour of group VII
elements, as is its ability to form the hydride H- ion, which has the
electron arrangement 1s.
The location of helium in group VIII seems to be at odds with its 1s
electron arrangement. Helium's chemical properties, however, are much more
in accord with those of the elements of group VIII than the elements of
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