Experimentally
This scientist conducted the Cathode Tube Experiment
JJ Thomson
This scientist developed the Uncertainty Princpiple
Werner Heisenberg
This model stated that most of an atom is empty space.
The nuclear model
Who discovered the neutron?
James Chadwick- a former student of Ernest Rutherford
This ancient Greek philosopher didn't like the idea of the Gods creating "nothing" and so he dismissed the first attempt at atomic theory.
Aristotle
This is the experiment that Ernest Rutherford conducted that showed the existence of a positively charged nucleus.
Gold Foil Experiment
This scientist developed the Plum Pudding Model
JJ Thomson
What was smeared or a cloud in the Plum Pudding Model?
JJ Thomson discovered the first subatomic particle. What experiment led to this discovery?
The Cathode Tube/Ray Experiment
Who invented the field of particle physics when he drilled a channel halfway into a lead block and deposited radioactive material in it?
Rutherford
Line spectra are what inspired this scientist to develop a new atomic model.
This scientist developed the planetary model of the atom.
Niels Bohr
In the Quantum Mechanical Model, where do we find electrons?
In orbitals, otherwise known as areas of probability.
In the Gold Foil Experiment, how did Rutherford know the charge (that is, positive or negative) of the nucleus?
The nucleus deflected the alpha particles, which have a positive charge. Therefore they must have a positive charge.
What is the name of John Dalton's atomic theory?
the Hard Sphere Model
The difficulty in predicting any spectral lines for systems larger than 1 electron led to these scientists to develop the "Wave Mechanical" Model.
You only need to list one of the three.
de Broglie (all matter has wavelengths)
Heisenberg (Uncertainty Principle) or
Schrodinger (Wavefunction- the mathematical formula for the electrons)
This scientist resurrected the concept of the atom.
John Dalton
In Democritus's atomos theory, what did the atomos look like?
The atomos looked like the properties of the substance- sharp for salt, strong hooks for iron.
What is the charge and relative mass of the three subatomic particles?
Protons= + and 1u
Neutrons= neutral and same size as protons, 1u
Electrons - and tiny! 1/2000 of 1u
This scientist believed the vast majority of an atom was empty space.
Rutherford
What experiment did John Dalton perform before coming up with the atomic theory?
NONE
This scientist proposed the nuclear model.
Ernest Rutherford
Where do we find electrons in Niels Bohr's model?
In orbits around the nucleus.
Where are electrons, protons, and neutrons in the current atomic model?
protons & neutrons- in the nucleus.
What is the difference between an orbit and an orbital?
orbit- set path
orbital- an area of probability of finding an electron