Chemistry Unit 1- fundamental ideas

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  • An atom is the smallest particle in the world, they make up everything
  • An element is made up of one type of atom
  • The periodic table is organised into groups and in these groups elements have similar properties 
  • A compound is two or more elements chemically joined
  • In an atom there is a nucleus surrounded by electrons (NEGATIVE CHARGE)
  • in the nucleus there is neutrons (NO CHARGE) and protons (POSITIVE CHARGE)
  • an atom has no overall charge because the number of protons is equal to the number of electrons
  • Atomic number of an element is the proton number and the number of electrons as theyre the same
  • Elements are


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