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The Periodic Table

Honors Chemistry - Krug

TermDefinition
Democritus Atomos - the smallest particle of an element that retains the properties of that element
Lavoisier Law of Conservation of Mass - the total mass of the products is the same as the total mass of the reactants
Proust Law of Definite Proportions - any chemical compound has a constant mass ratio of its elements
Dalton Ato T All elements are composed of atoms; Atoms cannot be created or destroyed in a chemical reaction; All atoms of an element are identical to the others, but different from atoms of other elements; All compounds have a constant ratio of atoms of element
Thomson Discovered the electron; plum pudding model
Milikan & Fletcher Oil Drop Experiment
Rutherford Gold Foil Experiment; discovered protons
Bohr Electrons are found in energy
Chadwick Neutrons and protons are in the nucleus; neutrons have the same mass as protons
Atomic Number How many protons and electrons
Atomic Mass Atomic Mass-Atomic Number=# of neutrons
Mendeleev Created the first periodic table; Eka-silicon - germanium, discovered it; Periodic Law - elements have patterns when listed in order
Dobereiner Triads
Newlands Law of Octaves
Meyer Classified 28 elements by weight
Rows Periods
Columns Groups
Group 1 Alkali Metals
Group 2 Alkali Earth Metals
Group 16 Oxygen Group (Chalcogens)
Group 17 Halogens
Group 18 Noble gases
Metals Left of stair-step line
Nonmetals Right of stair-step line
Metalloids Touching stair-step line
Representative Elements Follows patterns well; Groups 1, 2, 13-18
Transition Metals Not as predicable, non-reactive; Groups 3-12
Inner Transition Metals Lanthanides (La-Lu) and Actinides (Ac-Lr)
Diatomic Elements In pairs in pure elemental form; 02, F2, Cl2, Br2, I2, N2, H2
Created by: annabelle.mills
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