How many protons and how many electrons are in an oxygen ion that has a -2 charge?

1 Answer
Dec 30, 2016

An oxide ion has 8 protons and 10 electrons.


Oxygen has atomic number eight. This means that the nuclei of all oxygen atoms have eight protons. A neutral oxygen atom will also have eight electrons.

In an oxygen ion with a #2^-# charge, the number of protons is still 8, but the number of electrons is 10.

This results in the oxygen ion having an octet (8) of valence electrons.