What allows the formation of a positive ion?

May 10, 2017

Loss of Electron (s).

Explanation:

If an atom loses one or more electrons , it becomes positive ion.

May 10, 2017

See the explanation.

Explanation:

A positive ion is formed when an atom of a metal loses one or more electrons. This gives the metal ion a filled valence shell.

For example, a neutral sodium atom contains electrons in three main energy levels, n=1, n=2, n=3. It has one electron in its valence shell, which makes it unstable. When it loses the single electron in its valence shell to another atom, its second energy level has a full valence shell, which makes it stable, and the atom is now a sodium ion with a charge of ${1}^{+}$.