The attraction by the chlorine atoms is stronger than the attraction by the calcium atom. Two electrons are transferred from the calcium atom, one to each chlorine atom. Calcium becomes a +2 ion and ...

If the imbalance is too great, radioactive decay will occur. Up to two electrons may exist in the atom's first shell. Up to eight electrons may exist in the atom's second shell. An electron may ...

The electrons surround the nucleus in 3 dimensions but it is easier to show an energy level model in two dimensions like the model that looks like a target. This energy level model shows two electrons ...