C1 1.2 Atomic structure

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  • C1 1.2 Atomic structure
    • Atoms contain protons, neutrons and electrons
      • Protons and  Neutrons are found in the nucleus
      • Electrons orbit the nucleus
    • Proton has a  relative charge of +1(positive) and a relative mass of 1
    • Neutron has a neutral relative charge (0) and a relative mass of 1
    • Electron  has a relative charge of -1(negative) and a relative mass of 0
    • Any atom contains equal numbers of protons and electrons
    • Atomic number
      • The atomic number is the number of protons in the nucleus
      • The periodic table is arranged in order by atomic number
    • Mass number
      • The mass number is the number of protons plus neutrons
    • Number of neutrons= Mass number - Atomic number

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