Atmos that have gained or lost electrons are called

The answer is:Anion
Atoms consist of electrons, protons and neutrons. ... When an atom gains or loses an electron, it attains a net charge and becomes an ion. When electrons are lost (or donated), the resulting ion is called cation. When electrons are gained, the resulting ion is called an anion

They formed the oceans.  as they melted water was formed and the water made the oceans