How Many Valence Electrons Does Francium Have?

Francium is an alkali metal, so it has one valence electron. It is found in Group I of the Periodic Table. This valence electron is in the seventh energy level’s s-orbital.

Francium’s full set of electrons is written as 1s2 2s2p6 3s2p6d10 4s2p6d10f14 5s2p6d10 6s2p6 7s1, which can be shortened to [Rn] 7s1. In order, the configuration shows that each energy level of francium has one, two, eight, 18, 32, and 18 electrons. The atomic number of francium, 87, shows that it has 87 electrons and 87 protons in each atom. Fr is used to shorten the word “francium.”


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