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Atomic Structure

The nucleus is in the middle of the atom, like
the diagram suggests.
It contains two types of particles know as
Protons and Neutrons.
Overall the nucleus has a positive charge,
this is because protons have a positive
charge and neutrons have a neutral charge so

Page 2

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Mass Number:
Is the total number of protons and neutrons
The mass number is always bigger than the atomic number, normally
double the atomic number. This means that there are normally the same
amount of protons and neutrons in any atom.

Good luck in your exams and thanks for reading…


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