Hydrogen sometimes is ? an electron and sometimes it has an ? electron

Hydrogen sometimes is missing an electron and sometimes it has an extra electron.

Explanation:

Hydrogen, in its neutral form, does not have a neutron. There is only one electron and one proton.

Hydrogen can form a diatomic compound H₂ (where each hydrogen atom shares an electron) or it can also be in the form of an ion such as H⁺.

So hydrogen sometimes is missing an electron and sometimes it has an extra electron.

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