Atoms etc

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  • Atoms
    • The smallest particle of an element that can take part in a chemical reaction.
      • Contain even smaller particles called sub-atomic particles.
        • Protons
          • Relative charge is positive
          • Relative mass is 1
          • its in the nucleus with neutrons
        • Neutrons
          • its relative charge is neutral
          • Its relative mass is 1
          • its in the nucleus with protons
        • Electrons
          • In the shells surrounding the nucleus
          • Relative charge is Negative
    • Atomic symbols
      • Element symbol
        • substance made out of one type of atom-bulding blocks of life
      • Atomic number
        • number of protons in the nucleus
          • All atoms of a particular element have the same number of protons in their nucleus
      • Atomic mass number
        • sum of neutrons and protons
      • Mass number
      • relative atomic mass
        • This is the mass of an atom compared to all the other atoms in the periodic table. Its ratio has no units.
    • Isotopes
      • Are atoms that have the same number of protons but diffierent numbers of neutrons in their nucleus
  • Relative mass is 1/1835
    • it is negligible
    • Electrons
      • In the shells surrounding the nucleus
      • Relative charge is Negative
  • This is the mass of the atoms. It is caculated from adding the number of protons (Ar=1) to the numbers of neutrons (Ar=19, Electrons are regarded as having a mass of 0
    • Mass number

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