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CHEMISTS

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year of daltons atomic theory?
1803
Group
vertical row
period is the ___________ row on the periodic table
horizontal
periodic table
arrangement of ______________ separated into ________________________ based on______________ ________-
arrangement of elements separated into groups
based on reoccuring properties
atomic mass of an element is equal to the wighted average mass of the _______________________ in a sample
atoms
atomic mass unit
one twelfth of the mass of a carbon_12 atom
atomic number
number of protons in the nucleus of an atom of an element
nucleus is composed of _________ _______ and _________--
protons
neutrons
isotopes
atoms with the same number of protons
BUT NOT NEUTRONS
mass number
total number of protons and neutrons in an atom
neutrons
NO CHARGE
EQUAL MASS TO PROTON
protons
positively charged
cathode ray
glowing beam
electrons
negatively charged subatomic particles
Daltons atomic theory
1. all elements are composed of atoms which are indivisible and industructable
2. all atoms of the same element are exactly alike: they all have the same mass
3. atoms of different elements are different: they have different masses
4. compounds are formed by the joining of atoms of two or more elements in any compound that atoms of different elements are combined in diff. porportions.
atom
smallest particle of an element
scrodinger
motions of electrons
"electron cloud model"
moseley
each element has diff # of protons
proust
law of definite porportions

ALL COMPOUNDS HAVE DEFINITE PORPORTIONS
bohr
electrons move in circular orbit

"Charge cloud model"
rutherford
gold foil expirment
"atoms are empty space, most of mass in nucleus"
crookes
cathode ray
jj thomson
discovered electron and charge:mass ratio
"Plum pudding"
dalton
made the atomic theory
democritus
prosed atom
"indisible and instructable"
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