Chromium Bohr model

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In the chromium Bohr model, the nucleus comprises 24 protons and 28 neutrons. Surrounding this nucleus are four electron shells, accommodating a total of 24 electrons.

To draw the chromium Bohr model, represent the 24 protons, 28 neutrons, and 24 electrons. Begin by sketching the nucleus, and then draw the four electron shells. The first three shells should contain 2, 8, and 13 electrons, respectively, while the fourth shell holds the remaining 1 electron.

Steps

Write protons, neutrons, and electrons of chromium atom

Chromium has 24 protons, 28 neutrons, and 24 electrons.

Learn how to find: Chromium protons neutrons electrons

Draw nucleus of chromium atom

The nucleus of a chromium atom contains 24 protons and 28 neutrons. So draw the nucleus of chromium 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 24 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 24 – 2 = 22 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 24 – 10 = 14 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 13 electrons.

In the 3^rd electron shell, the 3d subshell has only five electrons. This is because according to the aufbau principle, the 4s subshell is filled first and then 3d, 4p, 5s… and so on.

Now we have already used 23 electrons in 1^st, 2^nd, and 3^rd electron shells, so we have 24 – 23 = 1 electrons left. So in the next step, we have to draw the 4^th electron shell.

Note: A half-full 3d subshell is more stable than a partially filled 3d subshell. That’s why the 3d subshell has five electrons (instead of four electrons). And the 4s subshell has one electron (instead of two electrons).

For a detailed explanation, check the orbital diagram of chromium.

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 subshell. And the green color represents the number of electrons in that subshell. This means that the 4^th electron shell has a total of 1 electron.

That’s it! This is the final Bohr model of chromium atom as we have used all 24 electrons: 2 electrons in the 1^st electron shell, 8 electrons in the 2^nd electron shell, 13 electrons in the 3^rd electron shell, and 1 electron in the 4^th electron shell.

Next: Manganese Bohr model

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Related

• Chromium

More topics

• Chromium orbital diagram
• Chromium protons neutrons electrons

External links

• File:24 chromium (Cr) enhanced Bohr model.png – Wikimedia Commons
• Chemical Elements.com – Chromium (Cr) – Chemical Elements.com
• What is the Bohr model for Chromium? – Topblogtenz
• Chromium (Cr) – Periodic Table – ChemicalAid
• Electrons In The Shells – Chromium – Chem4Kids