What is the electron configuration for Fr?

1 Answer
anor277
Aug 9, 2016

[Rn]7s^1

Explanation:

From the Periodic Table, Z, the atomic number of Fr=87

And thus,

1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)4d^(10)5s^(2)5p^(6)4f^(14)5d^(10)6s^(2)6p^(6)7s^1

Well, I have got 87 electrons there at least. Of course, all the action, all the chemistry takes place at 7s^1, i.e. Fr is univalent and would react as an alkali metal. It is extremely rare element and gram quantities would be unknown.

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