DEVELOPMENT OF PERIODIC TABLE

• 1st scientists to make a periodic table was John Dalton who ordered elements in order of atomic number
• In 1864, John Newland found Law of Octaves stating that properties of every 8th was similar
• In 1869, Dimitri Mendeleev placed elements into table used today however 50 elements hadn't been discovered
• Dimitri Mendeleev ordered elements in order of atomic number leaving spaces for undiscovered elements. He ordered the elements so elements around each other shared similar properties
• Dimitri Mendeleev made correct predictions about the missing elements by using ones around it to guess their properties
• In 1932, James Chadwick carried out an experiment explaining existance of neutrons
• Fracitional distillation is a technique used to seperate 2 liquids mixed together
• Simple distillation seperates a solvent from soluble solids dissolved in solvent