Dysprosium Bohr model

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The dysprosium Bohr model illustrates a nucleus with 66 protons and 96 neutrons. Orbiting this nucleus are six electron shells, housing a total of 66 electrons.

To draw the dysprosium Bohr model, represent the 66 protons, 96 neutrons, and 66 electrons. Begin by sketching the nucleus, and then draw the six electron shells. The first five shells should contain 2, 8, 18, 28, and 8 electrons, respectively, while the sixth shell holds the remaining 2 electrons.

Steps

Find protons, neutrons, and electrons of dysprosium atom

Dysprosium has 66 protons, 96 neutrons, and 66 electrons.

Dysprosium protons

• Protons = atomic number

From the periodic table, find the atomic number of dysprosium.

The atomic number of dysprosium is 66. Hence, dysprosium has a total of 66 protons.

Dysprosium neutrons

• Neutrons = atomic mass – atomic number

The atomic mass of dysprosium is 162.5, so we’ll take the roundup value as 162. And the atomic number of dysprosium is 66.

Subtract the atomic number (66) from the atomic mass (162). Hence, dysprosium has a total of 162 – 66 = 96 neutrons.

Dysprosium electrons

• Electrons = atomic number

The atomic number of dysprosium is 66. Hence, dysprosium has a total of 66 electrons.

Draw nucleus of dysprosium atom

The nucleus of a dysprosium atom contains 66 protons and 96 neutrons. So draw the nucleus of dysprosium 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 66 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 66 – 2 = 64 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 66 – 10 = 56 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 66 – 28 = 38 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 28 electrons.

In the 4^th electron shell, the 4f subshell has only ten electrons. 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 56 electrons in 1^st, 2^nd, 3^rd, and 4^th electron shells, so we have 66 – 56 = 10 electrons left. So in the next step, we have to draw the 5^th electron shell.

Still have a question: Why does the 4f subshell have only ten electrons?

Let’s draw the orbital diagram of dysprosium, and find the answer to the above question.

Answer: Once the 6s subshell is completely filled, then only we can mark electrons in the 4f subshell. That’s why in the 4^th electron shell, the 4f subshell has only ten electrons.

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 and 5p subshells. And the green and orange color represents the number of electrons in that subshell. This means that the 5^th electron shell has a total of 8 electrons.

The 5^th electron shell contains only 5s and 5p subshells, and not 5d and 5f subshells. 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 64 electrons in 1^st, 2^nd, 3^rd, 4^th, and 5^th electron shells, so we have 66 – 64 = 2 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 subshell. And the green color represents the number of electrons in that subshell. This means that the 6^th electron shell has a total of 2 electrons.

That’s it! This is the final Bohr model of dysprosium atom as we have used all 66 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, 28 electrons in the 4^th electron shell, 8 electrons in the 5^th electron shell, and 2 electrons in the 6^th electron shell.

Next: Plutonium Bohr model

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Related

• Dysprosium

More topics

• Dysprosium electron configuration

External links

• File:66 dysprosium (Dy) enhanced Bohr model.png – Wikimedia Commons
• Chemical Elements.com – Dysprosium (Dy) – Chemical Elements.com
• What is the Bohr model for Dysprosium? – Topblogtenz
• Dysprosium (Dy) – Periodic Table – ChemicalAid