I suppose that you think to ions.
Oxidation number
4
1
2
IT gains, looses, or shares outer electrons.
Hydrogen shares its electrons to complete the octate so it gains 1 electrons. it can also its electrons.
An ion. If there are less electrons than protons, the atom gains a positive charge and is called a cation. If there are more electrons than protons, the atom gains a negative charge and is called an anion.
It gains three, loses five, or shares pairs of electrons
It either gains, loses, or shares electrons.
When an atom loses or gains electrons, it becomes an ion.
One electron.
Electrons.