Strontium valence electrons

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Strontium valence electrons
Strontium valence electrons | Image: Learnool

Strontium, classified as an alkaline earth metal, possesses 2 valence electrons. To determine the valence electrons for strontium, one can refer to its position on the periodic table, like which group it is located in, or simply check its electron configuration.


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 strontium on the periodic table.

Strontium location marked on periodic table | Image: Learnool

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

Strontium 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 strontium is in group 2, it has 2 valence electrons.

Using electron configuration

  • First, write electron configuration of strontium

The electron configuration of strontium is [Kr] 5s2.

  • 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 (5) is marked with green color.

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

The 5th energy level contains 5s subshell and it has 2 electrons. So strontium has a total of 2 valence electrons.

Next: Cesium valence electrons


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