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Each atom of an element has the following electron configuration:
[tex]1s^2 \ 2s^2 \ 2p^6 \ 3s^2 \ 3p^6 \ 4s^2 \ 3d^{10} \ 4p^6 \ 5s^2 \ 4d^{10} \ 5p^5[/tex]

What is the name of the element?

A. Bromine
B. Iodine
C. Tellurium
D. Xenon



Answer :

Let's determine the element based on its electron configuration by summing up the number of electrons in each subshell.

The given electron configuration is:
[tex]\[ 1s^2 \ 2s^2 \ 2p^6 \ 3s^2 \ 3p^6 \ 4s^2 \ 3d^{10} \ 4p^6 \ 5s^2 \ 4d^{10} \ 5p^5 \][/tex]

Now we add the number of electrons in each subshell:

- [tex]\(1s^2\)[/tex] contributes [tex]\(2\)[/tex] electrons.
- [tex]\(2s^2\)[/tex] contributes [tex]\(2\)[/tex] electrons.
- [tex]\(2p^6\)[/tex] contributes [tex]\(6\)[/tex] electrons.
- [tex]\(3s^2\)[/tex] contributes [tex]\(2\)[/tex] electrons.
- [tex]\(3p^6\)[/tex] contributes [tex]\(6\)[/tex] electrons.
- [tex]\(4s^2\)[/tex] contributes [tex]\(2\)[/tex] electrons.
- [tex]\(3d^{10}\)[/tex] contributes [tex]\(10\)[/tex] electrons.
- [tex]\(4p^6\)[/tex] contributes [tex]\(6\)[/tex] electrons.
- [tex]\(5s^2\)[/tex] contributes [tex]\(2\)[/tex] electrons.
- [tex]\(4d^{10}\)[/tex] contributes [tex]\(10\)[/tex] electrons.
- [tex]\(5p^5\)[/tex] contributes [tex]\(5\)[/tex] electrons.

Summing these values together:

[tex]\[ 2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 + 2 + 10 + 5 = 53 \][/tex]

The total number of electrons in the atom is [tex]\(53\)[/tex], which corresponds to the atomic number of the element.

According to the periodic table, the element with atomic number [tex]\(53\)[/tex] is iodine.

Therefore, the name of the element is:
iodine

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