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23 Cards in this Set

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Dalton's Atomic Theory
1) All matter is composed of atoms
2) All atoms of the same element are identical
3) Atoms of different elements are different
4) Atoms unite in definite ratios to form compounds
Law of Multiple Proportions
written by John Dalton

If two or more different compounds are composed of the same two elements, the mass of the second element combined with a certain mass of the first element can be expressed as ratios of small whol numbers
Law of Conservation of Mass
written by Antoine Lavoisier
Law of Definite Proportions
The elements making up compounds are always in the same proportions by mass
Democritus
A Greek philosopher 400 B.C said all matter is made up of empty space and tiny particles called atoms. Atoms are the samallest amount of matter are there are different types.
Aristotle
384 - 322 B.C all matter was continuous and made up of one substance called hyle. This theory was acceptted untill the 17th century. Earth, wind, fire, and air
Joseph Proust
Law of Definite Proportions
Antoine Lavoiser
Law of Conservation of Mass
The Atom
The smalles piece of an element, Which still has the properties of that element.
Electron
e-

Has a negitive charge

The smallest part of the three major particles

Discovered by J.J Thomson
Protons
H+ or P+

Postulated by J.J Thomson

Larger than the electron

Found in nucleus
R.A Millikan
Millikan's Oil drop experiment

Determined the chage and therefore the mass of the electron
James Chadwick
Other Pieces
Proton
Positively charged pieces 1840 times heavier than the electron
Neutron
No charge but the same mass as a proton
What are the two brod classes of subatonic particles
Leptons
Hadrons
Hadrons
Mesons
Baryons
Quarks Types
Up
Down
Top
Bottom
Strange
Charmed
Quark Colors
Red
Green
Blue
Democritus and Leucippus
Matter is made up of indiisible particles
Dalton
One type of atom for each element
Thomson's Model
Discovered Electrons

Atoms were made of positive stuff

Negative electron floating around

called the Plum Pudding Model
Rutherford's model
Discovered dense Positive piece at the center of the atom and named it the nucleus