# Thallium Protons Neutrons Electrons (And How to Find them?)

Thallium has 81 protons, 123 neutrons and 81 electrons.

But how will you find the number of protons, neutrons and electrons in Thallium (Th)?

Well, it is very easy to find the protons, neutrons and electrons of thallium atom.

Here I have given a very simple method for finding the protons, neutrons and electrons of thallium atom.

Let’s dive right into it!

## Finding the Protons, Neutrons and Electrons in Thallium

How to find protons?

• The number of protons can be found by knowing the atomic number of that atom. [1]

How to find neutrons?

• The number of neutrons can be found by subtracting the atomic number from its atomic mass.

How to find electrons?

• For a neutral atom, the number of electrons can be found by knowing the atomic number of that atom.

Let’s calculate the number of protons, neutrons and electrons in thallium.

### #1 Number of Protons in Thallium

If you have a periodic table with you, then most of the answers are in front of you.

You can see the elements, their atomic number and their atomic mass from the periodic table.

Now here our element is Thallium (Th).

So from the above periodic table, you can see that the atomic number of thallium is 81.

As the atomic number of thallium is 81, it has a total of 81 protons in its nucleus.

Thus, the number of protons in Thallium is 81.

### #2 Number of Neutrons in Thallium

In order to find the number of neutrons of thallium atom, you should know its atomic mass first.

The number of neutrons in thallium can be obtained by subtracting the atomic number from its atomic mass.

The atomic mass of thallium is 204.38 u (which you can round it to 204). [2]

So from this atomic mass (i.e 204), you have to subtract its atomic number (i.e 81).

So you will get 204 – 81 = 123.

Thus, the number of neutrons in Thallium is 123.

### #3 Number of Electrons in Thallium

For a neutral atom, the number of electrons and the number of protons are the same.

Here, the thallium atom is a neutral atom.

So the number of electrons in thallium is equal to its number of protons (which is also equal to its atomic number).

In the beginning, we have found that the number of protons in thallium is 81.

Thus, the number of electrons in Thallium is 81.

## Summary

Number of Protons in Thallium

• The number of protons can be found by knowing the atomic number of that atom.
• Number of Protons in Thallium = Atomic number of Thallium = 81

Number of Neutrons in Thallium

• The number of neutrons can be found by subtracting the atomic number from its atomic mass.
• Number of Neutrons in Thallium = Atomic mass of Thallium – Atomic number of Thallium = 204 – 81 = 123

Number of Electrons in Thallium

• For a neutral atom, the number of electrons can be found by knowing the atomic number of that atom.
• Number of Electrons in Thallium = Atomic number of Thallium = 81

I hope you have understood the simple method for finding the protons, neutrons and electrons of thallium atom.

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