ch4. sec 1
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what did john dalton believe
that atoms were smooth, rock-like spheres that could be broken down anymore
what was john dalton’s model
plain circle
what did J.J Thomson discover
atoms had electrons
what did thomson propose
electrons were scattered throughout a ball of positively charged particles
what was thomson’s model
plus sign in a circle with electrons spread throughout the circle
what expirement did rutherford do
gold foil expirement
what are the discoveries of the gold foil expirement
discovery of the nucleus, nucleus is positively charged, most of the mass is concentrated in nucleus, the nucleus is tiny compared to the atom as a whole, the atom is mostly empty space
what was rutherford’s atomic model
nucleus in the middle and electrons orbiting the nucleus
what was bohr’s model
solar system image wise but with different energy levels with the electrons in those energy levels and the nucleus in the middle
specific amount of energy an electron has
energy level
what is an electron’s movement related to
it’s energy
what did schrodinger discover
electrons don’t orbit the nucleus in a specific pattern
what was schrodinger’s model
cloud model
describe schrodinger’s model
nucleus in the middle with the probable location of electrons around it
what did james chadwick discover
nuetrons were in the nucleus of an atom
in james chadwick’s model what made up the center of an atom
dense nucleus made up of protons and nuetrons
how much amu is one proton
1
in chadwick’s model what surrounded the nucleus
cloudlike region of moving electrons
how much amu is one nuetron
1
how much amu is one electron
1/1836
what does amu mean
atomic mass unit
how much electrons does it take to equal the mass of 1 proton and nuetron
1836
who created the first periodic table
Dimitri Mendeleev
when did Dimitri Mendeleev create the first periodic table
1869