Hydrogen valence electrons

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Hydrogen valence electrons
Hydrogen valence electrons | Image: Learnool

Hydrogen possesses 1 valence electron. The valence electrons of hydrogen can be determined using two different methods – by referring to the periodic table or by utilizing 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 hydrogen on the periodic table.

Hydrogen location marked on periodic table | Image: Learnool

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

Hydrogen 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 hydrogen is in group 1, it has 1 valence electron.

Using electron configuration

  • First, write electron configuration of hydrogen

The electron configuration of hydrogen is 1s1.

  • 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 (1) is marked with green color.

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

The 1st energy level contains 1s subshell and it has 1 electron. So hydrogen has a total of 1 valence electron.

Next: Helium valence electrons


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