Question #0af92

1 Answer
Paul G.
Sep 27, 2017

Hydrogen

Explanation:

Hydrogen is the only element with one valence electron

There are numerous ions that can have 1 valence electron, but most are unlikely to exist due to the incredible amount of energy required to remove them (ionization energy).
#He^(1+)# for example or #Li^(2+)#

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