8
Consider an atom of oxygen in which the nucleus contains 8 protons and 8 neutrons. If it is doubly ionized, what is the charge of the oxygen ion and how many electrons remain in the ion?
It needs 2 electrons for this. Oxygen makes -2 ion by gaining 2 electrons. It is the most stable ion that oxygen makes.
The resulting oxygen ion has a charge of -2.
-2
Oxygen wants to gain 2 electrons, so its charge would be 2-, because electrons have a negative charge.
12
Consider an atom of oxygen in which the nucleus contains 8 protons and 8 neutrons. If it is doubly ionized, what is the charge of the oxygen ion and how many electrons remain in the ion?
It needs 2 electrons for this. Oxygen makes -2 ion by gaining 2 electrons. It is the most stable ion that oxygen makes.
The resulting oxygen ion has a charge of -2.
There are 16 electrons in this ion. 7 from nitrogen, 8 from oxygen and the other one is from the ionic charge.
-2
Oxygen wants to gain 2 electrons, so its charge would be 2-, because electrons have a negative charge.
An Oxygen atom would never contain 10 electrons on its own. It would have a maximum of 8 electrons at one time, unless the "oxygen atom" you are referring to is in fact an oxygen ION, in which case the charge would be -2. However, an oxygen ion can never be "by itself". It must be bonded with either itself as a diatomic or with another element as a compound.
The # of Valance electrons in the oxygen famly is 6
Oxygen has 6 core electrons.
Oxygen, O. Oxygen is in Group 6. It has six electrons in its outer shell. It gains two electrons from one or two other atoms in reactions, forming an oxide ion, O 2-
It has gained 2 electrons.