Cesium valence electrons

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Cesium valence electrons
Cesium valence electrons | Image: Learnool

Cesium has 1 valence electron.


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

#1 Using periodic table
#2 Using electron configuration

Let’s break down each method in detail.

Using periodic table

Periodic table | Image: Learnool

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

Now mark the location of cesium on the periodic table.

Cesium location marked on periodic table | Image: Learnool

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

Cesium group number marked on periodic table | Image: Learnool

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 cesium is in group 1, it has 1 valence electron.

Using electron configuration

  • First, write electron configuration of cesium

The electron configuration of cesium is [Xe] 6s1.

  • Second, find highest energy level in electron configuration
Green colored number represent highest energy level | Image: Learnool

In the above electron configuration, the highest energy level (6) is marked with green color.

  • Finally, count electrons of that energy level
Number circled with green color represent electrons | Image: Learnool

The 6th energy level contains 6s subshell and it has 1 electron. So cesium has a total of 1 valence electron.

Next: Barium valence electrons


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