Neodymium Bohr model

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In the neodymium Bohr model, a nucleus with 60 protons and 84 neutrons is at the core. Orbiting this nucleus are six electron shells, housing a total of 60 electrons.

To draw the neodymium Bohr model, outline the 60 protons, 84 neutrons, and 60 electrons. Start by illustrating the nucleus, and then draw the six electron shells. The first five shells should contain 2, 8, 18, 22, and 8 electrons, respectively, while the sixth shell holds the remaining 2 electrons.

Steps

Find protons, neutrons, and electrons of neodymium atom

Neodymium has 60 protons, 84 neutrons, and 60 electrons.

Neodymium protons

• Protons = atomic number

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

The atomic number of neodymium is 60. Hence, neodymium has a total of 60 protons.

Neodymium neutrons

• Neutrons = atomic mass – atomic number

The atomic mass of neodymium is 144.242, so we’ll take the roundup value as 144. And the atomic number of neodymium is 60.

Subtract the atomic number (60) from the atomic mass (144). Hence, neodymium has a total of 144 – 60 = 84 neutrons.

Neodymium electrons

• Electrons = atomic number

The atomic number of neodymium is 60. Hence, neodymium has a total of 60 electrons.

Draw nucleus of neodymium atom

The nucleus of a neodymium atom contains 60 protons and 84 neutrons. So draw the nucleus of neodymium 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 60 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 60 – 2 = 58 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 60 – 10 = 50 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 60 – 28 = 32 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 22 electrons.

In the 4^th electron shell, the 4f subshell has only four 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 50 electrons in 1^st, 2^nd, 3^rd, and 4^th electron shells, so we have 60 – 50 = 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 four electrons?

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 four electrons.

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

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 58 electrons in 1^st, 2^nd, 3^rd, 4^th, and 5^th electron shells, so we have 60 – 58 = 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 neodymium atom as we have used all 60 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, 22 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: Promethium Bohr model

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Related

• Neodymium

More topics

• Neodymium electron configuration
• Neodymium orbital diagram

External links

• File:60 neodymium (Nd) enhanced Bohr model copy.png – Wikimedia Commons
• Chemical Elements.com – Neodymium (Nd) – Chemical Elements.com
• What is the Bohr model for Neodymium? – Topblogtenz
• Neodymium (Nd) – Periodic Table – ChemicalAid