Strontium Bohr model

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In the strontium Bohr model, the nucleus comprises 38 protons and 50 neutrons. Surrounding this nucleus are five electron shells, hosting a total of 38 electrons.

To draw the strontium Bohr model, represent the 38 protons, 50 neutrons, and 38 electrons. Start by sketching the nucleus, and then illustrate the five electron shells. The first two shells should contain 2 and 8 electrons, respectively, while the third shell holds 18 electrons. The fourth and fifth shells accommodate 8 and 2 electrons, respectively.

Steps

Write protons, neutrons, and electrons of strontium atom

Strontium has 38 protons, 50 neutrons, and 38 electrons.

Learn how to find: Strontium protons neutrons electrons

Draw nucleus of strontium atom

The nucleus of a strontium atom contains 38 protons and 50 neutrons. So draw the nucleus of strontium 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 38 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 38 – 2 = 36 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 38 – 10 = 28 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 38 – 28 = 10 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 8 electrons.

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

Now we have already used 36 electrons in 1^st, 2^nd, 3^rd, and 4^th electron shells, so we have 38 – 36 = 2 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 subshell. And the green color represents the number of electrons in that subshell. This means that the 5^th electron shell has a total of 2 electrons.

That’s it! This is the final Bohr model of strontium atom as we have used all 38 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, 8 electrons in the 4^th electron shell, and 2 electrons in the 5^th electron shell.

Next: Cesium Bohr model

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Related

• Strontium

More topics

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

External links

• File:38 strontium (Sr) enhanced Bohr model.png – Wikimedia Commons
• What is the Bohr model for Strontium? – Chemistry QnA – Topblogtenz
• Chemical Elements.com – Strontium (Sr) – Chemical Elements.com
• Strontium (Sr) – Periodic Table (Element Information & More) – Periodic Table Guide
• 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
• Bohr Diagrams of Atoms and Ions – Chemistry LibreTexts
• Strontium (Sr) – Periodic Table – ChemicalAid