The Valence electron
Potassium has 1 electron in its outer energy level. When it forms a bond, it typically donates this electron to another element, leaving it with a full outer energy level.
Cesium, or Cs, has 1 valence electron.
The group that needs one more electron to fill its outer energy level is the group of elements located on the right side of the periodic table known as Group 17, or the Halogens. These elements have seven valence electrons and are just one electron short of a full outer energy level.
The electrons on the outtermost energy level of an atom is called a valence electron.
nobel gases has few electron in the outer energy level
The outer energy level for an atom is determined by the highest principal quantum number, n. In this case, the highest n value in the electron configuration is 4. Therefore, the outer energy level is the fourth energy level.
Energy levels
Bromine has 7 electrons in its outer energy level, making it one electron short of a full outer shell.
depends. Moving from an inner level to an outer level, the e- absorbs energy. Moving from an outer level to an inner level, the e- loses energy.
Hydrogen has only 1 electron and has only 1 energy level.
A neutral sodium atom has 11 electrons. In its outer energy level, it has 1 electron. Sodium's electron configuration is 2-8-1.
Californium has seven electron shells ; the outer shell has two electrons.