Covalent bonds do not gain or lose electrons, but rather share electrons.
Polonium lose electrons.
sn lose 4 electrons
Sodium lose electrons becoming a cation.
Chlorine gain electrons.
No. Atoms can gain and lose electrons but seldom gain or lose protons.
It needs to gain 3 electrons than to lose 5 electrons. So phosphorus has to gain 3 electrons.
Covalent bonds do not gain or lose electrons, but rather share electrons.
Lose
Sodium loses its one valence electron to become Na+
When atoms lose or gain electrons, they form ions. These are charged particles.
Se will gain electrons
In phosphene it gain 4 electrons. Phosphate lose 4 electrons
Lose electrons is oxidation. To gain electrons is reduction.
If you mean Metals... No, they do not gain electrons, they actually lose electrons because it is a lot easy for them to lose them so they can gain stability much faster.
Polonium lose electrons.
sn lose 4 electrons