Potassium has one.
The element would be potassium (K).
There is just one valance electron in the element potassium.
Potassium
1 valence electron
potassium is in group 1 and calcium in group 2, so potassium has 1 valence electron and calcium 2.
There is only one valance electron in potassium.
Hydrogen, lithium, sodium, potassium, rubidium, cesium, and francium have one valence electron.
Potassium has 19 total electrons and one electron in its 4th energy level.
calcium
The order is: Iodine (7 valence electrons) Carbon (4 valence electrons) Calcium (2 valence electrons) Sodium (1 valence electron)
4
Valence = 1..