Astatine Valence Electrons

Astatine Valence Electrons
Astatine valence electrons

Astatine has 7 valence electrons.

Methods

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

#1 Using periodic table
#2 Using electron configuration

Let’s break down each method in detail.

#1 Using Periodic Table

Periodic table

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

Now mark the location of astatine on the periodic table.

Astatine location marked on periodic table

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

Astatine group number marked on 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 astatine is in group 17, it has 7 valence electrons.

#2 Using Electron Configuration

  • First, write electron configuration of astatine

The electron configuration of astatine is [Xe] 6s2 4f14 5d10 6p5.

  • Second, find highest energy level in electron configuration
Green colored number represent highest energy level

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

The 6th energy level contains 6s and 6p subshells. There are 2 electrons in the 6s subshell and 5 electrons in the 6p subshell. So astatine has a total of 2 + 5 = 7 valence electrons.

Next: Radon Valence Electrons

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