Beryllium valence electrons

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Beryllium valence electrons
Beryllium valence electrons | Image: Learnool

Beryllium, an alkaline earth metal, holds 2 valence electrons. The valence electrons of beryllium can be determined by two methods, directly locating its position on the periodic table or using 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 beryllium on the periodic table.

Beryllium location marked on periodic table | Image: Learnool

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

Beryllium 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 beryllium is in group 2, it has 2 valence electrons.

Using electron configuration

  • First, write electron configuration of beryllium

The electron configuration of beryllium is [He] 2s2.

  • 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 (2) is marked with green color.

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

The 2nd energy level contains 2s subshell and it has 2 electrons. So beryllium has a total of 2 valence electrons.

Next: Sodium valence electrons


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