John Newlands - idea of repeating octaves of properties
Dimitry Mendeleyev - arranged known elements according to atomic weights and properties. Made predictions which were later proven accurate.
Henry Moseley - utilised X-Ray. Said that periodic table should be based on atomic numbers of elements.
Dalton = atom as the basic unit of an element that can enter into a chemical combination// very small and indivisible// everything is made up of discreet building blocks, that is atoms.
J.J Thompson - electrons - cathode ray - studying the deflection of a ray of high-speed electrons fired at a fluorescent screen and deflected with the aid of magnetic fields and electric fields.
The charge of an electron is -1.60 * 10^-19 C // The mass of an electron is 9.09 * 10^-28 g.
Fe2+ is ferrous ion // Fe3+ is ferric ion // Silicide = Si4- // Nitride N3- // Phosphide P3- // Sulfide S2- // Carbonate (CO3)2- // Chromate (CrO4)2- // Dichromate (Cr2O7)2- // Permanganate (MnO4)- // Peroxide (O2)2-......

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Title: Mr.
Approximate Word Count: 4527
Approximate Pages: 19 (250 words per double-spaced page)

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