AS Chemistry - Atomic Structure

Revision for AS Topic 1.5 - Atomic Structure

  • definitions
  • protons, neutrons, electrons
  • mass spectrometer
  • isotopes
  • I.E
  • electron configurations
  • electron affinities
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  • Created by: Pennaling
  • Created on: 10-10-12 19:19

Definitions

Atomic Number:- the number of protons in an atom

Mass Number:- the number of protons and neutrons in an atom

Isotopes:- atoms of the same element with the same number of protons but different numbers of neutrons

Weighing Atoms:- standard mass = 1/12th mass of one atom of carbon 12

Relative Isotopic Mass:- mass of one atom of an isotope relative to 1/12th of one carbon 12 atom

Relative Atomic Mass:- weighted average mass of one atom, relative to 1/12th mass of one atom of carbon 12

Relative Molecular Mass:- weighted average mass of one molecule relative to 1/12th of one atom of carbon 12

1st Ionisation energy:- energy required to remove 1 electron from each atom is 1 mole of atoms of an element

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Protons, Neutrons and Electrons

Mass Charge Protons 1 +1 Neutrons 1 0 Electrons 1/2000 -1 Protons and Neutrons are found in the nucleus, Electrons found around the outside of the nucleus at different energy levels.

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Mass Spectrometer

(http://scienceaid.co.uk/chemistry/fundamental/images/spectrometer.jpg)

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