Oxygen will bond (share electrons) with other atoms to produce stable compounds
ex. H2O ,O2
Oxygen is an oxidizer, it will gain electrons in a reaction to complete it's valence shell.
Elements in the oxygen family, such as oxygen, sulfur, selenium, and tellurium, typically gain two electrons to achieve a full outer shell of eight electrons like a noble gas. However, they can also share electrons through covalent bonding to achieve stability.
Atoms in the oxygen family can gain or share two electrons in order to achieve an octet of electrons.
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.
An oxygen atom typically gains two electrons to form a stable bond, fulfilling its octet rule. This allows the oxygen atom to achieve a full outer electron shell, resulting in greater stability.
Magnesium has a charge of 2+ and oxygen 2- Magnesium will lose the two "extra electrons" in its valence shell when creating an ionic bond with oxygen. The oxygen will gain these two electrons.
Oxygen tends to gain two electrons to fill its outer shell, resulting in a deficiency of electrons.
Oxygen tends to gain two electrons to complete its "octet", making it O2- with the electron configuration 1s22s22p6
Phosphorus wants to gain three electrons to have 8 valence electrons.
It can do both. It gains electrons in Phosphene, loses electrons in Phosphate.
Oxygen wants to gain 2 electrons, so its charge would be 2-, because electrons have a negative charge.
Oxygen will tend to gain 2 electrons to form an ion with a charge of -2. This is because oxygen has 6 valence electrons and is looking to achieve a stable octet configuration like the nearest noble gas, which has 8 valence electrons.