one
The electron shell.
hi
Valence.
Most of the volume in an atom is occupied by the electron cloud. Most of the complex reactions of the atom occur in the cloud.
Only two electron shells.
An electron in the outermost energy level of an atom is called a valence electron.(We refer here to the outermost occupied levels of an atom. There are, of course, many other higher energy levels normally available that are not occupied.)These electrons determine the chemical reactivity of the atom.the valence electrons
When it is stable. that is, all of it's electron shells are fully occupied.
This is a chemical element. You can find the how many electron in a single atom by using a periodic table.
It is the proportion of the spinner's perimeter that is occupied by the section (or sections) with a value of 1.
the lowest energy level occupied by an electron when an atom is in its most stable energy state
Which orbital is being occupied ^^^^ WRONG UPDATE 1/12/16: APEX ANSWER IS The energy level of the electron.
they are called electron shells or sometime orbits. there are 32 electron shells. this is also called the electric cloud in the modern atomic model.