Arsenic has 5 valence electrons.
We can write the valence electrons of arsenic 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 arsenic on the periodic table.
Next, mark the group number of arsenic 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 arsenic is in group 15, it has 5 valence electrons.
Using electron configuration
- First, write electron configuration of arsenic
The electron configuration of arsenic is [Ar] 4s2 3d10 4p3.
- Second, find highest energy level in electron configuration
In the above electron configuration, the highest energy level (4) is marked with green color.
- Finally, count electrons of that energy level
The 4th energy level contains 4s and 4p subshells. There are 2 electrons in the 4s subshell and 3 electrons in the 4p subshell. So arsenic has a total of 2 + 3 = 5 valence electrons.
- Arsenic Bohr model
- Arsenic electron configuration
- Arsenic orbital diagram
- Arsenic protons neutrons electrons
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