How Many Valence Electrons Does Strontium Have?

How Many Valence Electrons Does Strontium Have?

Strontium has two valence electrons. It lies in the family of elements called the alkaline earth metals. Strontium never exists as a pure element in nature and is usually found in the minerals celestite and strontianite.

When exposed to air, elemental strontium reacts with oxygen and turns from a silvery hue to a yellowish color as strontium and oxygen form strontium oxide. Because strontium has two electrons in its outermost energy level, it acts as an electron donor. To attain a more stable configuration, atoms want to fill their outermost energy level, which is usually eight electrons. Strontium prefers to lose two electrons instead of having to gain six electrons; therefore, strontium is an electropositive element and is considered an electron donor.