GCSE Chemistry 3

• Hydrogen in now on its own not in group 1
• group 2 elements in Newlands periodic table are now group 1 elements 
• group 8 is missing 
• in this periodic table the group number and number of electrons in the outer most shell of the element aren't equivalent like they are the modern periodic table

• Noble gases have now been discovered 
• the elements in the modern periodic table are ordered by proton number rather than increasing atomic mass like they were in the early periodic table

• Use a Protective shield between him and the reaction in case the reaction is explosive
• wear goggles because potassium produces a lilac flame 
• only use a small mass of the reactant since the reactants are reactive

Te from group 6 has a larger relative atomic mass than I when group 6 elements should have a lower relative atomic mass than elements in group 7

in the modern periodic table the elements are ordered by increasing proton number so the elements are in the right order because Te has a simpler atomic number of 52 than that of I whose atomic number is 53