Calcium Bohr model

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The calcium Bohr model includes a nucleus with 20 protons and 20 neutrons. Surrounding this nucleus are four electron shells, holding a total of 20 electrons.

To draw the calcium Bohr model, represent the 20 protons, 20 neutrons, and 20 electrons. Start by sketching the nucleus, and then illustrate the four electron shells. The first two shells should contain 2 and 8 electrons, respectively, while the third and fourth shells hold 8 and 2 electrons, respectively.

Steps

Write protons, neutrons, and electrons of calcium atom

Calcium has 20 protons, 20 neutrons, and 20 electrons.

Learn how to find: Calcium protons neutrons electrons

Draw nucleus of calcium atom

The nucleus of a calcium atom contains 20 protons and 20 neutrons. So draw the nucleus of calcium 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 20 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 20 – 2 = 18 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 20 – 10 = 10 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 and 3p subshells. And the green and orange color represents the number of electrons in that subshell. This means that the 3^rd electron shell has a total of 8 electrons.

The 3^rd electron shell contains only 3s and 3p subshells, and not a 3d subshell. 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 18 electrons in 1^st, 2^nd, and 3^rd electron shells, so we have 20 – 18 = 2 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 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 2 electrons.

That’s it! This is the final Bohr model of calcium atom as we have used all 20 electrons: 2 electrons in the 1^st electron shell, 8 electrons in the 2^nd electron shell, 8 electrons in the 3^rd electron shell, and 2 electrons in the 4^th electron shell.

Next: Rubidium Bohr model

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Related

• Calcium

More topics

• Calcium orbital diagram
• Calcium protons neutrons electrons
• Calcium valence electrons

External links

• File:20 calcium (Ca) enhanced Bohr model.png – Wikimedia Commons
• How to draw Bohr diagram for Calcium (Ca) atom – Topblogtenz
• What is the Bohr model for calcium? – Homework.Study.com
• In a calcium atom, the Bohr model of the atom is 2, 8, 8, 2, but in the Strontium atom it is 2, 8, 18, 8, 2? Shouldn’t the third orbital be 8 instead of 18? Why give a different number for the third orbital? – Quora
• Chemical Elements.com – Calcium (Ca) – Chemical Elements.com
• How to Draw the Bohr-Rutherford Diagram for Calcium – Pinterest
• Bohr Diagrams of Atoms and Ions – Chemistry LibreTexts
• Why is the valency of the Calcium (Ca) Bohr model, set to 2 electrons, instead of 1 electron for stability? – Chemistry Stack Exchange
• How to Build a Model of an Calcium Atom – Sciencing
• Calcium – Key Stage Wiki
• How can I make a calcium atom model? – Socratic