AQA C2 Chemical Calculations

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  • Atoms of particular element always have the same number of protons but different neutrons.
  • Atoms of the same element with different numbers of neutrons are called isotopes.
  • Isotopes does not mean that the atoms is radioactive
  • Atoms of different isotopes have different masses

Atomic number means the number of protons

Mass number means the total number of protons and neutrons


Relative Atomic Mass

12   (Mass Number)


6  (Atomic Number)

Particle Relative Mass

Proton 1

Neutron 1

Electron       tiny

Relative Formula Mass

  • Sum of the relative atomic masses of all the…


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