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19 Cards in this Set

  • Front
  • Back
atomic number
# of protons.....
equal to # of electrons
result # 1
conclusion # 1
1)most alphas go straight through foil
1) atoms are mostly empty
result 2
some alphas go to the side
1) electrons are outside of nuclues
result and conc. # 3
very few come back in yo facw
2) most mass in nucleus is verrrrrrrrrrrrrry small
other explanations with no backup
electrons are spinning
existence of neutron
like planetary system
electron cloud
3d and stays same distance away (same orbit)
quark
break down of protons and neutrons
(red green blue)
names of quarks
truth and beauty
strange and charm
up and down
atomic mass number
average weight of nuclues
((add up and divide))
masss #
protons plus neutrons
isotope
atoms of same element
right of stairstep
nonmetals
stair step
metalloids
left of stairs
metals
said atom is the building block if alll matter
Democritus
carbon's atomic mass #
12
alpha shooter project
helped out
Ernest Rutherford
Geiger, Marsden, Bohr
Bohrs rule
2-8-8-rest
in periodic table...elements react (how?)
going down column
Dmitri Mendeleev