Francium valence electrons

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Francium has 1 valence electron.

Methods

We can write the valence electrons of francium using two different methods:

#1 Using periodic table
#2 Using electron configuration

Let’s break down each method in detail.

Using periodic table

Get the periodic table having the chemical elements marked on it as mentioned above.

Now mark the location of francium on the periodic table.

Next, mark the group number of francium on the periodic table.

The valence electrons of each main-group element can be determined by the column in which it is located.

(i.e., all group 1 elements have 1 valence electron, all group 2 elements have 2 valence electrons, skip the transition metals… then, all group 13 elements have 3 valence electrons, all group 14 elements have 4 valence electrons, and so on up to group 18 elements)

Since francium is in group 1, it has 1 valence electron.

Using electron configuration

• First, write electron configuration of francium

The electron configuration of francium is [Rn] 7s¹.

• Second, find highest energy level in electron configuration

In the above electron configuration, the highest energy level (7) is marked with green color.

• Finally, count electrons of that energy level

The 7^th energy level contains 7s subshell and it has 1 electron. So francium has a total of 1 valence electron.

Next: Radium valence electrons

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Related

• Periodic table

More topics

• Francium
• Francium Bohr model
• Francium orbital diagram
• Francium protons neutrons electrons

External links

• https://www.sciencecoverage.com/2020/12/francium-valence-electrons.html
• https://www.reference.com/science-technology/many-valence-electrons-francium-55c262b47aef9708
• https://materials.gelsonluz.com/2019/08/valence-electrons-in-francium-fr-facts.html