Astatine valence electrons

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Astatine, typically considered a post-transition metal but sometimes classified as a metalloid, holds 7 valence electrons. The valence electrons of astatine can be determined by looking at its group number on the periodic table or by reviewing its electron configuration.

Methods

Using 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.

Next, mark the group number of astatine 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 astatine is in group 17, it has 7 valence electrons.

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

In the above electron configuration, the highest energy level (6) is marked with green color.

• Finally, count electrons of that energy level

The 6^th 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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Related

• Periodic table

More topics

• Astatine
• Astatine Bohr model

External links

• https://www.quora.com/How-many-valence-electrons-does-astatine-have
• https://materials.gelsonluz.com/2019/08/valence-electrons-in-astatine-at-facts.html