CH38: Describe what an isotope is

CH39: Explain why not all mass numbers are whole numbers

CH40: Calculate the relative atomic mass of an isotope

CH41: Estimate the abundance of isotopes (H)

CH42: Describe how Mendeleev arranged his Periodic Table

CH43: Explain how Mendeleev predicted the properties of undiscovered elements

CH44: Explain what Mendeleev did when properties didn't match

CH45: Describe how the atomic number is linked to the Periodic Table

CH46: Describe the structure of the Periodic Table

CH47: Identify where metals / non-metals are found on the Periodic Table

CH80: What is the Empirical formula?

CH81: Investigate the Empirical formula of Magnesium Oxide

CH79: Calculate the empirical formula