Helium Bohr model

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Helium Bohr model
Helium Bohr model | Image: Learnool

In the helium Bohr model, the nucleus is central, housing 2 protons and 2 neutrons. Orbiting this nucleus is a single electron shell, accommodating 2 electrons.

To draw the Bohr model of helium, note the 2 protons, 2 neutrons, and 2 electrons. Start by illustrating the nucleus, and then depict the first electron shell.


Write protons, neutrons, and electrons of helium atom

Helium has 2 protons, 2 neutrons, and 2 electrons.

Draw nucleus of helium atom

The nucleus of a helium atom contains 2 protons and 2 neutrons. So draw the nucleus of helium atom as follows:

Helium nucleus
Helium nucleus | Image: Learnool

Now in the next step, draw the 1st electron shell and start marking electrons.

Draw 1st electron shell

Remember that we have a total of 2 electrons.

The 1st electron shell (containing s subshell) can hold up to a maximum of 2 electrons. So draw the 1st electron shell as follows:

Helium shell 1
Helium 1st electron shell drawn | Image: Learnool

In the above image, 1 represents the 1st electron shell that contains 1s subshell. And the green color represents the number of electrons in that subshell. This means that the 1st electron shell has a total of 2 electrons.

That’s it! This is the final Bohr model of helium atom as we have only 2 electrons and that are marked in the 1st electron shell.

Next: Lithium Bohr model


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