History of Atomic Theory
the philosopher who believed atoms were indivisible spheres that had the properties of the material they made up
Democritus
Electromagnetic radiation is commonly known as this
light
the subatomic particle in the atom which has the smallest mass
electron
a packet of energy
quantum
The “address” of the electron
quantum state
Used the gold foil experiment and discovered protons
Ernest Rutherford
The wavelengths of visible light are in this range
400-750nm
the current model of the atom
quantum model
The two concepts that light is a wave and a particle are related using this equation (just name it)
Planck's Relation
The principle which states that two electrons cannot inhabit the same quantum state
Pauli Exclusionary principle
discovered the neutron and contributed to the development of the atomic bomb
James Chadwick
longer wavelengths have _________ energy and _________ frequency
lower, lower
The planetary model of atoms was developed by this scientist
Niels Bohr
Atoms are in this state when they have absorbed energy
Excited
the Principle quantum number tells us
the shell the electron is in
the scientist who used the cathode ray tube and discovered electrons
J J Thomson
besides visible light, name two types of electromagnetic radiation
microwaves, gamma rays, X-rays, UV, IR, AM radio, FM radio
The Bohr model couldn’t explain what two things
1) energy levels for any element except hydrogen
2) electron placement for elements above element 18
Electrons in their lowest possible energy level are in this state
Ground
the subshells are labelled using which letters
s, p, d, f, g
the scientist who discovered the mass and charge of the electron
Robert Millikin
a packet of light
photon
This scientist came up with an equation which could be used to calculate all possible energy levels of any atom
Schrödinger
The rule that tells us the order of the subshells & orbitals from lowest to highest energy
The rule that says lower energy orbitals must be filled before higher energy orbitals
Aufbau Principle