Edexcel AS Chemistry - Atoms and Moles

  • Created by: Booga
  • Created on: 30-12-10 18:57


Consists of 3 particles:

Particle             Mass             Charge

Protons               1                     +1

Neutrons             1                       0

Electrons       1/2000 (0)           -1


Isotopes- Atoms of the same element with the same number of protons but a different number of Neutrons.

  • Same chemical properties as the number of protons and electrons have not changed
  • Different physical properties because the change in neutron number means the mass of the atom has changed

Ions- An ion is a molecule or atom in which the number of electrons is either more or less to the total number of protons

- Negative Ions: These are atoms which contain more electrons than protons (e.g. Br-)

+ Positive Ions: These


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