atomic structure

• what is the defintion of an atom

  the smallest part of any substance
• what is the definition of an element

  a substance made from only one type of atom
• what is the definition of a compound

  Two or more elements chemically bonded together
• What is the definition of a mixture

  a mixture is made up of two or more substances combined together
• what is a molecule

  two or more of the same element conjoined together