How to find the Protons Neutrons and Electrons of an element on the Periodic Table

Thursday, May 28, 2020

How many protons, neutrons, and electrons does Boron have?

The periodic table provides a wealth of information for the elements. However, if you can't read the periodic table it is not very helpful.
Let's go over some basics found in each box of the periodic table.

periodic table

You can easily fill out this chart if you know just a couple of facts.

periodic table box

Let's use Boron as an example.

periodic table boron

The Atomic Number identifies the element and the number of protons.
Boron has 5 protons.
In order to find the electrons take the atomic number and subtract the charge. A neutral element will have a 0 charge. An ion will have a plus or minus charge.

The atomic mass is the average mass of isotopes of elements.
If you round this to the closest whole number if is the mass number which is a combination of protons and neutrons.

If you subtract the mass number minus the protons this will be an element's neutrons.
Boron would have 11 - 5 = 6 neutrons.

In the video, I work through each example. I find the protons, neutrons, and electrons for Silver, Potassium, Tin,  and Fluorine.


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