chapter 3
cathode ray tube
contains a cathode shoots the electrons and an anode focuses them into thin beam
discovered by j. j. thompson
John Dalton
said
1. element made up of tiny particles called atoms
2. in an ordinary chem reaction atoms move from one substance to another but no atom of any element disappears or is changed to a different element
3. compounds are formed when atoms of 2 or more elements combine
max Planck
proposed that frequencies of vibration of the atoms/ molecules in the black body quantized
energies given by E= Hv H is plancks constant
V(nu) is the frequence of vibration
davidson and germer
demonstrated that electrons can be diffracted proving Broglie right
Vsper model
can be used to predict the electronicc and molecular geometry of molecule or polyotomic ions
Eugene Goldstein
Discovered the proton
james chadwick
disovery of the neutron
albert einstien
proposed that light not only moves in waves, but can behave as a stream of particles called photons
energy of photon is is given by E= hv = he/v
developed the wave mechanical model of a hydrogen atom
n.v sidwick and hm powel
developed vsper model
plum pudding model
made by j. j. Thompson model that proposed that within an atom there are negatively charged electrons in the shape of plum pudding
the mass spectrometer
Bohr model of a hydrogen atom
extended the idea of energy quantization said that the potential energy of a hydrogen atom also quantized
electrons can only nihabit certain energy levels at fixed distances from the nucleas
pauli exclusion principle
that no 2 electrons can have the same set of four quantum numbers
lavosier
created the law of conservation of mass also known as father of modern chemistry
nuclear model
made by Ernest Rutherford brought on by Rutherford's gold foil experiment lead to the discovery of the nucleus
dimitri and juliius meyer
made the periodic table
neills bohr
proposed that the electron in an hydrogen atom could orbit around the hydrogen nucleus
friedrich hund
predicted that when several orbiitals of equal energy are avaliable electrons enter slightly with aparalell spins
joseph proust
law of constant composition
gold foil experiment
experiment where Rutherford shot alpha particles out of a radioactive source into a thin piece of gold foil with a detector screen placed around the gold foil to dect any deflected particles
device used to measure the pressure in a substance
louis de Broglie
if light could behave as both a wave and a particle then maybe so could electrons
gn lewis
j.j. thompson
electrons are negitavly charged and are 1/2000 the mass of hydrogen