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Atoms Periodic Table

People, Periodic Laws, Trends

TermDefinition
Lavosier - Developed first 33 Elements - Distinguished Metals and Non-Metals
Moseley - Reordered periodic table by atomic #'s - Modified Periodic Law
Meyer - Periodic Table of 56 elements - Molar Volume - Atomic Weight
Cannizaro - Determined atomic weights for elements
Doberiner Similar elements had relative atomic mass - "Triads"
Dechancourtois - Periodic table in a cylinder - Unbroken order of increasing weight of an atom
Mendeleyev Sole Originator of Periodic table - Forecasted properties of unknown elements - Organized based on chemical properties - Periodic Law
John Dalton -Mass of an atom was the most important property
Seaborg Removed heaviest elements in periodic table and put them below - "actinade - lanthinide series
Greek Thinkers Created words "Element" and "Atom" - Described the differences of smallest parts of matter
Newlands Arranged elements based on Atomic weights - Octaves
Ionization Energy how easy it is for an atom to receive an electron - Increases ------> - Decreases down - Has so many shells, it forgets some are there for FRancium
Electronegativity how strongly the nucleus pulls on electrons - Increases ------> - Decreases down - Fluorine has 7 valence electrons and not a ton of shells yet "Pauling"
Atomic Radius size of an atom; 1/2 distance between 2 nuclei of the same element - Decreases -------> - Increases down
Created by: adobill