Francium Bohr model

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In the francium Bohr model, a nucleus with 87 protons and 136 neutrons is present. Surrounding this nucleus are seven electron shells, holding a total of 87 electrons.

To draw the francium Bohr model, outline the 87 protons, 136 neutrons, and 87 electrons. Begin by illustrating the nucleus, and then depict the seven electron shells. The first six shells should contain 2, 8, 18, 32, 18, and 8 electrons, respectively, while the seventh shell holds the remaining electron.

Steps

Write protons, neutrons, and electrons of francium atom

Francium has 87  protons, 136 neutrons, and 87 electrons.

Learn how to find: Francium protons neutrons electrons

Draw nucleus of francium atom

The nucleus of a francium atom contains 87 protons and 136 neutrons. So draw the nucleus of francium 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 87 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 87 – 2 = 85 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 87 – 10 = 77 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 87 – 28 = 59 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, 4p, 4d, and 4f subshells. And the green, orange, pink, and blue color represents the number of electrons in that subshell. This means that the 4^th electron shell has a total of 32 electrons.

Now we have already used 60 electrons in 1^st, 2^nd, 3^rd, and 4^th electron shells, so we have 87 – 60 = 27 electrons left. So in the next step, we have to draw the 5^th electron shell.

Draw 5^th electron shell

The 5^th electron shell can hold up to a maximum of 50 electrons. So draw the 5^th electron shell as follows:

In the above image, 5 represents the 5^th electron shell that contains 5s, 5p, and 5d subshells. And the green, orange, and pink color represents the number of electrons in that subshell. This means that the 5^th electron shell has a total of 18 electrons.

The 5^th electron shell contains only 5s, 5p, and 5d subshells, and not a 5f subshell. This is because according to the aufbau principle, the 6s subshell is filled first and then 4f, 5d, 6p… and so on.

Now we have already used 78 electrons in 1^st, 2^nd, 3^rd, 4^th, and 5^th electron shells, so we have 87 – 78 = 9 electrons left. So in the next step, we have to draw the 6^th electron shell.

Draw 6^th electron shell

The 6^th electron shell can hold up to a maximum of 72 electrons. So draw the 6^th electron shell as follows:

In the above image, 6 represents the 6^th electron shell that contains 6s and 6p subshells. And the green and orange color represents the number of electrons in that subshell. This means that the 6^th electron shell has a total of 8 electrons.

The 6^th electron shell contains only 6s and 6p subshells, and not 6d and 6f subshells. This is because according to the aufbau principle, the 7s subshell is filled first and then 5f, 6d, 7p… and so on.

Now we have already used 86 electrons in 1^st, 2^nd, 3^rd, 4^th, 5^th, and 6^th electron shells, so we have 87 – 86 = 1 electron left. So in the next step, we have to draw the 7^th electron shell.

Draw 7^th electron shell

The 7^th electron shell can hold up to a maximum of 98 electrons. So draw the 7^th electron shell as follows:

In the above image, 7 represents the 7^th electron shell that contains 7s subshell. And the green color represents the number of electrons in that subshell. This means that the 7^th electron shell has a total of 1 electron.

That’s it! This is the final Bohr model of francium atom as we have used all 87 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, 32 electrons in the 4^th electron shell, 18 electrons in the 5^th electron shell, 8 electrons in the 6^th electron shell, and 1 electron in the 7^th electron shell.

Next: Radium Bohr model

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Related

• Francium

More topics

• Francium orbital diagram
• Francium protons neutrons electrons
• Francium valence electrons

External links

• File:87 francium (Fr) enhanced Bohr model.png – Wikimedia Commons
• What is the Bohr model for Francium? – Chemistry QnA – Topblogtenz
• Chemical Elements.com – Francium (Fr) – Chemical Elements.com
• Francium (Fr) – Periodic Table – ChemicalAid
• Francium (Fr) – Periodic Table (Element Information & More) – Periodic Table Guide