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Chem chapter 4 sg

TermDefinition
Democritus believed that atoms were indivisible + indestructible
John Dalton created first modern atomic theory (after scientific method)
Atom smallest particle of an element that retains its identity in a chemical reaction
Inside of an atom protons, neutrons, and electrons
Dalton's theory part 1 and 2 atoms were tiny + indivisible and atoms of same element are identical but differ form other atoms,
Dalton's theory part 3 and 4 atoms of different elements can mix/be chemically combined to form a compound and atoms can join and rearrange but never charge into different types of atoms
Daltons revised theory Atoms were tiny with subatomic particles and atoms of the same element can have isotopes with neutrons
JJ Thompson discovered the electron by using cathode ray tube
Eugen Goldstein discovered protons using cathode tube/canal rays
Ernest Rutherford used gold foil experiment to find that atoms were mainly empty space containing a dense and small positively charged core (nucleus)
James Chadwick also discovered neutron
Ion charged particle because an atom either lost or gained 1 ore more electrons
cations positively charged ions that occur when an atoms loses 1 or more electrons
anions negatively charged ions that occur when an atom gains 1 or more electrons
atomic mass weighted average of all the isotopes of an element
atomic mass equation (mass isotope 1 x relative abundance) + (mass isotope 2 x relative abundance)
finding relative abundance divide % abundance by 100
what is atomic number is equal to # of protons
mass number protons + neutrons
isotope atoms of the same element that differ in their # of neutrons
Created by: chelseataylor
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