1. The Development of the Periodic Table of Elements
ARISTOTLE

2. The Development of the Periodic Table of Elements
LAVOISIER
acid-making elements
gas-like elements
metallic elements
earthy elements
sulphur
light
cobalt, mercury, tin
lime (calcium oxide)
phosphorus
caloric (heat)
copper, nickel, iron, 
magnesia (magnesium oxide)
charcoal (carbon)
oxygen
gold, lead, silver, zinc
barytes (barium sulphate)
azote (nitrogen)
manganese, tungsten
argilla (aluminium oxide)
hydrogen
platina (platinum)
silex (silicon dioxide)

3. The Development of the Periodic Table of Elements
Jöns Jakob Berzelius
Developed a table of atomic weights Introduced letters to symbolize elements.

4. The Development of the Periodic Table of Elements
DoberEiner
lithium, sodium and potassium
(ii) calcium, strontium and barium
(iii) chlorine, bromine and iodine

5. The Development of the Periodic Table of Elements
NEwLands
Newlands' Octaves 1864 H Li Ga B C N O F Na Mg Al Si P S Cl K Ca Cr Ti Mn Fe
Co, Ni Cu Zn Y In As Se Br Rb Sr
Ce, La Zr
Di, Mo
Ro, Ru Pd Ag Cd U Sn Sb Te I Cs
Ba, V Ta W Nb Au
Pt, Ir Tl Pb Th Hg Bi

6. The Development of the Periodic Table of Elements
Mendeleev

7. The Development of the Periodic Table of Elements
William Ramsay
The Nobel Prize in Chemistry 1904 was awarded to Sir William Ramsay "in recognition of his services in the discovery of the inert gaseous elements in air, and his determination of their place in the periodic system".

8. The Development of the Periodic Table of Elements
Moseley
With the discovery of isotopes of the elements, it became apparent that atomic weight was not the significant player in the periodic law
When atoms were arranged according to increasing atomic number, the few problems with Mendeleev's periodic table had disappeared. Because of Moseley's work, the modern periodic table is based on the atomic numbers of the elements.

9. The Development of the Periodic Table of Elements
Seaborg
1940
Won the 1951 Nobel Prize in Chemistry for "discoveries in the chemistry of the transuranium elements", contributed to the discovery and isolation of ten elements, and developed the actinide concept, which led to the current arrangement of the actinoid series in the periodic table of the elements.