Atoms that have lost or gained electron(s) are called ions. If they are positively charged (lost an electron(s)), they are called cations. If they are negatively charged (gained an electron(s), they are called anions.
Ion
An atom that has gained an electron becomes a negatively charged ion.
They form an ionic compound.
In the ion of barium, two electron are lost to follow the octet rule (to have a complete valence electron shell).
Generically an "ion", specifically gained an electron an "anion", lost and electron a "cation".
Atoms that have lost or gained electron(s) are called ions. If they are positively charged (lost an electron(s)), they are called cations. If they are negatively charged (gained an electron(s), they are called anions.
Just electron
A charged chlorine atom, or a chlorine ion, would have gained or lost an electron. If it gained an electron, it would have a charge of -1. If it lost an electron, it would have a charge of +1.
It gains 1.
neutron
Ion
It forms a new atom.
They form an ionic compound.
An atom that has gained an electron becomes a negatively charged ion.
-Apex: They form an Ionic Compound.
Electron(s).