How To Calculate The Number of Protons, Neutrons, and Electrons - Chemistry

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in this lesson we're going to talk about

how to calculate the number of protons

neutrons and electrons in an atom and in

an ion so let's use sodium as an example

and on a periodic table you might see

something that looks like this the

smaller of the two numbers is the atomic

number which is also equal to the number

of protons the larger of the two numbers

is known as the average atomic mass now

sometimes you might see a problem that's

written this way they may tell you to

find the number of protons neutrons and

electrons for this particular element

now in this format you can see that the

atomic number is on the bottom the

number on the top noticed that it's not

the same as twenty two point nine nine

in fact it's rounded this is not the

average atomic mass but rather it is the

mass number so this is a specific