Atomic Structure - AS AQA unit 1

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  • Created by: Kathy
  • Created on: 19-04-11 11:17

Atomic Structure.

Protons: mass of 1, relative charge of +1

Neutrons: mass of 1, relative charge of 0

Electrons: mass of 5.4x10-4, relative charge of -1

mass number: total number of protons plus neutrons.

atomic number is the number of protons in the nucleus.

isotopes: elements of the same number of electrons and protons (same atomic number) but different mass number, so different number of neutrons. 

number of neutrons = mass number - atomic number.

properties of an isotopes:

  • same atomic number
  • different neutron number
  • rate of diffusion is different
  • different


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