Arsenic Bohr model

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In the arsenic Bohr model, the nucleus comprises 33 protons and 42 neutrons. Orbiting this nucleus are four electron shells, carrying a total of 33 electrons.

To draw the arsenic Bohr model, represent the 33 protons, 42 neutrons, and 33 electrons. Begin by sketching the nucleus, and then draw the four electron shells. The first three shells should contain 2, 8, and 18 electrons, respectively, while the fourth shell holds the remaining 5 electrons.

Steps

Write protons, neutrons, and electrons of arsenic atom

Arsenic has 33 protons, 42 neutrons, and 33 electrons.

Learn how to find: Arsenic protons neutrons electrons

Draw nucleus of arsenic atom

The nucleus of an arsenic atom contains 33 protons and 42 neutrons. So draw the nucleus of arsenic atom as follows:

Now in the next step, draw the 1^st electron shell and start marking electrons.

Draw 1^st electron shell

Remember that we have a total of 33 electrons.

The 1^st electron shell (containing s subshell) can hold up to a maximum of 2 electrons. So draw the 1^st electron shell as follows:

In the above image, 1 represents the 1^st electron shell that contains 1s subshell. And the green color represents the number of electrons in that subshell. This means that the 1^st electron shell has a total of 2 electrons.

Since we have already used 2 electrons in the 1^st electron shell, now we have 33 – 2 = 31 electrons left. So in the next step, we have to draw the 2^nd electron shell.

Draw 2^nd electron shell

The 2^nd electron shell (containing s subshell and p subshell) can hold up to a maximum of 8 electrons. So draw the 2^nd electron shell as follows:

In the above image, 2 represents the 2^nd electron shell that contains 2s and 2p subshells. And the green and orange color represents the number of electrons in that subshell. This means that the 2^nd electron shell has a total of 8 electrons.

Now we have already used 10 electrons in 1^st and 2^nd electron shells, so we have 33 – 10 = 23 electrons left. So in the next step, we have to draw the 3^rd electron shell.

Draw 3^rd electron shell

The 3^rd electron shell (containing s subshell, p subshell, and d subshell) can hold up to a maximum of 18 electrons. So draw the 3^rd electron shell as follows:

In the above image, 3 represents the 3^rd electron shell that contains 3s, 3p and 3d subshells. And the green, orange, and pink color represents the number of electrons in that subshell. This means that the 3^rd electron shell has a total of 18 electrons.

Now we have already used 28 electrons in 1^st, 2^nd, and 3^rd electron shells, so we have 33 – 28 = 5 electrons left. So in the next step, we have to draw the 4^th electron shell.

Draw 4^th electron shell

The 4^th electron shell (containing s subshell, p subshell, d subshell, and f subshell) can hold up to a maximum of 32 electrons. So draw the 4^th electron shell as follows:

In the above image, 4 represents the 4^th electron shell that contains 4s and 4p subshells. And the green and orange color represents the number of electrons in that subshell. This means that the 4^th electron shell has a total of 5 electrons.

That’s it! This is the final Bohr model of arsenic atom as we have used all 33 electrons: 2 electrons in the 1^st electron shell, 8 electrons in the 2^nd electron shell, 18 electrons in the 3^rd electron shell, and 5 electrons in the 4^th electron shell.

Next: Selenium Bohr model

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Related

• Arsenic

More topics

• Arsenic electron configuration
• Arsenic orbital diagram
• Arsenic protons neutrons electrons
• Arsenic valence electrons

External links

• File:33 arsenic (As) enhanced Bohr model.png – Wikimedia Commons
• Chemical Elements.com – Arsenic (As) – Chemical Elements.com
• How to draw Bohr diagram for Arsenic (As)? – Topblogtenz
• How to Make an Atom Arsenic Model – Sciencing
• Arsenic (As) – Periodic Table – ChemicalAid
• Can you draw a Bohr-Rutherford diagram for Arsenic – Numerade