C1 Atomic Structure / Periodic Table

• Chemical reaction


  Leads to an energy change
• Compound


  The combination of elements that have fixed properties
• Elements


  A substance made up of atoms of the same type
• Mixture


  When different substances are combined together but not chemically bonded
• Compounds can be separated into their elements
• Periodic table


  A table that lists all the elements
• The periodic table gives information about the elements including their symbol, atomic number and group
• Fluorine has the symbol F
• Iron has the symbol Fe
• CaCO3 is a compound made up of the elements Ca, C and O</b>
• Chlorine has the symbol Cl and is in group 7
• NaCl is a compound made up of the elements Na and Cl
• Copper oxide has the formula CuO
• Chemical reactions


  1. Reactants

  2. Products
• In a chemical reaction, the reactants are not destroyed or created, just rearranged
• The products of a chemical reaction are different from the reactants
• The arrow in a chemical equation shows the direction of the reaction
• The numbers in a chemical formula represent the number of atoms of each element
• Mixtures consist of different elements chemically joined together
• Elements and compounds can be identified from their symbols or formulas
• Compounds are arranged in a specific order according to the periodic table
• Compounds are arranged in groups (versions) and periods (rows)
• Chemical equations need to be balanced to show no creation or destruction of elements
• Chemical equations use symbols, formulas, and arrow notation to represent products
• Subscript numbers in chemical formulas indicate the number of that element present