Atoms and Elements

• Atom


  A smallest piece of an element
• Subatomic particle

  A particle is smaller than an atom. They are protons, neutrons, and electrons.
• Element


  A substance made up from one type of atom
• Periodic table


  A table showing the names and symbols of all the different types of elements.
• Chemical symbol


  A universal code which represents an element such as o for oxygen and cl for chlorin.
• molecule


  A small group of atoms chemically bonded together.
• Mixture


  A substance made up of 2 or more elements/compounds that are not boned together.
• Solvent


  A liquid that dissolves substances
• How are the subatomic particles arranged in an atom ?

  Protons and neutrons in a nucleus, electrons travel around the nucleus in shells.
• what is between the nucleus and shells?

  Empty space
• How can atoms be different from each other?

  In the number of protons, neutrons and electrons they have.
• How many different atoms are there?

  118
• What is the change and relative mass of a protone ?

  Change=+1
• what is the change and relative mass of a proton ?

  Change=+1