the first shell always have 2 electrons except for a hydrogen atom.

Oxidation is when atoms form a cation(s).

They are very reactive. They all have one valence electron.the futher down you look in the group, the more reactive is the element that come next. They all tend to form positive ion and when they form ion, the ion are always smaller then the parent atom.

They have one valence electron.

The ability of an atom to lose or gain electrons ?

An element is a pure substance that can contain only one only one kind of atom while a compounds is a pure substances made up of atom of two or more different element join by chemical bonds. Atom and molecule are very similar. They are the smallest unit of a substance that keep all the … Read more

The ion and its parent have the same number of neutrons and protons in their nucleus, but they have different number of electrons. By...lochard philozin