Atom, elements and compounds

• compounds

  a compound is made up of more than one element. the elements in a compound are chemically bonded
• elements

  elements are substances that are made up of only one type of atom. the periodic table organises elements into groups of similar properties
• Atoms 


  an atom is the smallest part of an element that can exist
• atomic number

  an atomic number defines an element. atomic number = no. of protons and no. of electrons