GCSE Chemistry Unit 3 Revision (2)

The Modern Periodic Table

• When the periodic table was first released, many scientists didn't take it seriously.
• At the time, there wasn't much evidence to suggest that the elements really did fit together in that way.
• After Mendeleev released his ideas, newly discovered elements fitter into the gaps he left.
• Once there was more evidence, scientists started to realize that the periodic table could be useful to predict properties of elements. 
• In the late 19th century, scientists discovered protons, neutrons and electrons. The periodic table matches up to what has bee discovered about the structure of the atom.
• The modern periodic table is based on electronic structures.
• When electrons, protons and neutrons were discovered, the periodic table was arranged in order of atomic (proton) number. All elements were put into groups.
• You can use the periodic table to work out the detailed arrangement of electrons in an atom of any element. Once you know the electron arrangement…