1.1.1 Atoms, Elements & Compounds

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Cards (20)

  • What are all substances made of?
    Atoms.
  • What is an atom?
    The smallest part of an element that can exist.
  • Atoms of each element are represented by what?
    Chemical symbols.
  • How many different elements are there?
    118.
  • Where are elements shown?
    The periodic table.
  • What is the charge on a proton?
    Positive.
  • Which two things make up the nucleus of an atom?
    Protons and neutrons.
  • Which particle determines what element an atom is?
    Protons.
  • What do we call an atom that has a positive or negative charge?
    An ion.
  • Electrons orbit the nucleus in energy…?
    Shells.
  • What two particles have the same amount?
    Protons and electrons.
  • What is an ion?
    An atom or group of atoms that has lost or gained electrons.
  • Are the number of electrons and protons in an ion equal?
    No.
  • What is an element?
    A substance made up of atoms that all have the same number of protons in their nucleus.
  • Atoms of each element can be represented by a what?
    One or two letter symbol.
  • What is a compound?
    A compound is a substance composed of two or more elements chemically bonded together.
  • How are chemical bonds formed?
    Electron sharing or transfer between atoms.
  • How do you separate a compound?
    A chemical reaction.
  • What does a formula show?
    The atoms that make up a compound.
  • 9 formulas which may come in handy:
    1. Carbon dioxide = CO2
    2. Ammonia =NH3
    3. Water = H2O
    4. Sodium chloride = NaCl
    5. Carbon monoxide = CO
    6. Hydrochloric acid = HCl
    7. Calcium chloride = CaCl2
    8. Sodium carbonate = Na2CO3
    9. Sulfuric acid = H2SO4