15 terms

scientists ch 4

discovered nucleus had positive charge- protons. did gold foil experiment
William Thomson
first to state that electrons are building blocks of atoms
J.J. Thomson
discovered isotopes and electrons. plum pudding model
bombarded atoms w/ alpha particles, and noticed beam of radiation. The beam had no charge, and the molecules had mass
interpreted Curie's idea and called them neutrons
model later proved wrong by Heisenberg. planetary model- said that electrons move around the nucleus in energy levels and its called the planetary model because the e- orbit the nucleus like the planets orbit the sun
uncertainty principle- you can pinpoint speed or location of electrons but not both at the same time
quantum theory- e=hv. figured out that electron magnetic energy is quantized for a given frequency of radiation (or light)
accurately discovered charge of an electron
Hund's rule
each orbital in a sub level is filled singlely before it doubles
Schrodinger & Broglie
wave/mechanical model and discovered orbitals
discovered atomic theory: elements made of atoms, compounds 2+ different atoms, atoms cant be destroyed, same atoms are same.
plum pudding model
the model of the atom created by JJ Thomson, consists of electrons on the surface of a positively charged sphere
gold foil experiment
Rutherford's experiment involving shooting alpha particles at gold foil and observing them going through and bouncing off determining that the nucleus of an atom has a positive charge
wave mechanical model
path of electron in hydrogen atom cannot be determined precisely but probably, like fireflies flying around a room