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

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

The nucleus

An atom consists of a central massive part called the nucleus and electrons revolving round the nucleus.

Most of the space in the atom is empty.

Almost the entire mass of the atom is concentrated in the nucleus which contains protons and neutrons.

We now believe that the nucleus of an atom is built up of protons and neutrons.

The particles that reside inside the nucleus are called nucleons.

An atom as a whole is neutral, as the number of protons in its nucleus is equal to the number of electrons revolving round it.

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

Thanks 

 
  10/01/12 11:50 AM
 

 

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