C1.8

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  • C1.8 Electronic structure
    • Electrons are arranged around the nucleus in shells
      • Each shell is a different energy level
      • First shell can hold 2 electrons, the second can hold 8 electrons
    • Electronic structure shows the number of electrons in each energy level
      • E.g. sodium has 11 electrons so it is 2,8,1
    • Elements in the same group have the same number of electrons on the outer most shell
      • For example group 1 have one electron on the outer shell
      • This means that they all react chemically in the same way
    • Group 0 are the noble gases that're very unreactive elements.
      • They have 8 electrons on the outer shell

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