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 :

To determine the name of the element based on its electron configuration, follow these steps:

1. Understand the Electron Configuration Notation:
The notation [tex]\( 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^{10} 4p^6 5s^2 4d^{10} 5p^5 \)[/tex] represents the distribution of electrons across different orbitals and energy levels.

2. Total the Number of Electrons:
Each superscript number indicates the number of electrons in that particular subshell. Summing these numbers will give the total number of electrons in the atom.
- [tex]\(1s^2\)[/tex]: 2 electrons
- [tex]\(2s^2\)[/tex]: 2 electrons
- [tex]\(2p^6\)[/tex]: 6 electrons
- [tex]\(3s^2\)[/tex]: 2 electrons
- [tex]\(3p^6\)[/tex]: 6 electrons
- [tex]\(4s^2\)[/tex]: 2 electrons
- [tex]\(3d^{10}\)[/tex]: 10 electrons
- [tex]\(4p^6\)[/tex]: 6 electrons
- [tex]\(5s^2\)[/tex]: 2 electrons
- [tex]\(4d^{10}\)[/tex]: 10 electrons
- [tex]\(5p^5\)[/tex]: 5 electrons

3. Sum the Electrons:
[tex]\[ 2 + 2 + 6 + 2 + 6 + 2 + 10 + 6 + 2 + 10 + 5 = 53 \][/tex]
The total is 53 electrons.

4. Identify the Element:
The atomic number of an element corresponds to the number of protons, which is equal to the number of electrons in a neutral atom. The element with atomic number 53 is iodine.

Therefore, the name of the element is iodine.