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Periodicity (Origin (Other key figures (John Newlands (March 1895, Lothar…
Periodicity
Origin
1869
Atomic number ^ --> Properties repeat
Dmitri Mendeleev
Other key figures
John Newlands (March 1895
Lothar Mayer (1868)
Alexandre-Emile Béguyer de Chancourtois (1862)
What is it
Table showing all elements
Sorted by properties and atomic number
Periods and Groups
Groups
1 - Alkali metals
Tiny
Lose electrons in bond
Explode in water
2 - Alkaline Earth Metals
2+ ions
Not as reactive as group 1 metals
3-12 - Transition elements
Multiple charges
17 - Halogen
Corrosive
Gain electrons easily
18 Noble Gas
Stable Octet
Unreactive
Elements in group with similar properties
Melting point increased as you go down a group
Periods
Elements show gradual changes in property across a period
