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Rev. Notes > IGCSE > The Nuclear Atom
Previous Topic The Nuclear Atom Next Topic

The structure of an atom Rutherford's atomic model The nucleus
The proton number The nucleon number

The nucleon number

The mass of an atom is specified by its mass number which is the total number of protons and neutrons present in the nucleus of the atom.

It is denoted by A.


A = Number of protons + Number of neutrons




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Diaf Said :
Very good notes
------------------------------------------------------------------------------------- Admin Replied:


  10/01/12 11:50 AM


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