Question

why the elements do not get ionized when they share the electrons

Answer 1

The elements donot get ionized because they are not giving up their electrons or taking electrons . They are just sharing. For eg. Co2

Here carbon shares its two electrones with one oxygen atom and 4 electrons with two oxygen atom.

This does not mean that carbon is gaining any electron. This type of bond is covalent bond. And it is between two non metals.

Answer 2

Most atoms do not have eight electrons in their valence electron shell. ... Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations