Various, 2016, Development of the periodic table, www.rsc.org/periodic-table/history/about, 19/11/16
Various, 2016, Periodic table history, www.lenntech.com/periodic/history/history-periodic-table.htm, 19/11/16
Unknown, 05/01/16, Development of the periodic table, sciencelearn.org.nz/Contexts/Just-Elemental/Looking-Closer/Development-of-the-periodic-table, 19/11/16
Various, 06/11/16, Periodic Table, en.wikipedia.org/wiki/Periodic_table, 19/11/16
Tim Sharp, 05/01/16, Periodic Table, www.livescience.com/25300-periodic-table.html, 19/11/16
Various, 2014, Periodic Table, www.bbc.co.uk/bitesize/standard/chemistry/elementsandreactions/periodic/revision/1/, 19/11/16
Unknown, 29/12/14, Henry Mosley, www.famousscientists.org/henry-moseley/, 20/11/16
Elizabeth Palermo, 14/05/15, Niels Bohr: Biography & Atomic Theory, www.livescience.com/32016-niels-bohr-atomic-theory.html, 20/11/16
Various, 04/11/16, Dmitri Mendeleev, en.wikipedia.org/wiki/Dmitri_Mendeleev, 20/11/16
Various, 04/11/16, Henri Becquerel, en.wikipedia.org/wiki/Henri_Becquerel, 20/11/16
Katherine D. Watson, 04/01/10, Sir William Ramsay, www.britannica.com/biography/William-Ramsay, 20/11/16
Various, Unknown, Phosphorus, www.rsc.org/periodic-table/element/15/phosphorus, 26/11/16
Unknown, 2016, Phosphorus, www.chemistryexplained.com/elements/L-P/Phosphorus.html, 26/11/16
Unknown, Unknown, Phosphorus Properties, www.elementalmatter.info/phosphorus-properties.htm, 26/11/16
Unknown, 12/2/16, Phosphorus Element Facts, www.chemicool.com/elements/phosphorus.html, 26/11/16
Unknown, 2015, Phosphorus, www.elementsdatabase.com/Phosphorus-P-15-element/, 26/11/16
Various, 2016, Titanium, www.rsc.org/periodic-table/element/22/titanium, 27/11/16
Various, 12/2/16, Titanium Element Facts, www.chemicool.com/elements/titanium.html, 27/11/16
Various, 2016, Periodic table history, www.lenntech.com/periodic/history/history-periodic-table.htm, 19/11/16
Unknown, 05/01/16, Development of the periodic table, sciencelearn.org.nz/Contexts/Just-Elemental/Looking-Closer/Development-of-the-periodic-table, 19/11/16
Various, 06/11/16, Periodic Table, en.wikipedia.org/wiki/Periodic_table, 19/11/16
Tim Sharp, 05/01/16, Periodic Table, www.livescience.com/25300-periodic-table.html, 19/11/16
Various, 2014, Periodic Table, www.bbc.co.uk/bitesize/standard/chemistry/elementsandreactions/periodic/revision/1/, 19/11/16
Unknown, 29/12/14, Henry Mosley, www.famousscientists.org/henry-moseley/, 20/11/16
Elizabeth Palermo, 14/05/15, Niels Bohr: Biography & Atomic Theory, www.livescience.com/32016-niels-bohr-atomic-theory.html, 20/11/16
Various, 04/11/16, Dmitri Mendeleev, en.wikipedia.org/wiki/Dmitri_Mendeleev, 20/11/16
Various, 04/11/16, Henri Becquerel, en.wikipedia.org/wiki/Henri_Becquerel, 20/11/16
Katherine D. Watson, 04/01/10, Sir William Ramsay, www.britannica.com/biography/William-Ramsay, 20/11/16
Various, Unknown, Phosphorus, www.rsc.org/periodic-table/element/15/phosphorus, 26/11/16
Unknown, 2016, Phosphorus, www.chemistryexplained.com/elements/L-P/Phosphorus.html, 26/11/16
Unknown, Unknown, Phosphorus Properties, www.elementalmatter.info/phosphorus-properties.htm, 26/11/16
Unknown, 12/2/16, Phosphorus Element Facts, www.chemicool.com/elements/phosphorus.html, 26/11/16
Unknown, 2015, Phosphorus, www.elementsdatabase.com/Phosphorus-P-15-element/, 26/11/16
Various, 2016, Titanium, www.rsc.org/periodic-table/element/22/titanium, 27/11/16
Various, 12/2/16, Titanium Element Facts, www.chemicool.com/elements/titanium.html, 27/11/16