Charged atoms or groups of atoms. compounds ions molecules elements

The grouped atoms with charges are called ions.

When an atoms losses electron, then it forms positive ion or cation whereas when an atoms losses electron, then it forms negative ion or anion. The attraction between two ions leads to formation of the ionic bond.

There are many types of ions which includes monoatomic ions which contains one atoms and polyatomic ions which contains two or more atoms. When atoms are converted into ions, then the atom is undergoing ionization process.  

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

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