A monoatomic ion that has 18 electrons and `+2` charge:

A monatomic species that has 18 electrons and a net charge of 2^(-) has

An ion that has 18 electrons in the outermost shell is

An ion that has 18 electrons in the outermost shell is

A monoatomic gas molecule has

An atom changes to a charged particle called ion if it loses or gains electrons. The charge on an ion is the charge on electrons plus charge on protons. Now, write the missing information in the table given below:

An ion has 18 electrons in the outermost shell it is

An ion has 18 electrons in the outermost shell , it is