Atomic Physics Flashcards
Thompson’s raisin bun model
used cathode rays to discover the electron and determine charge to mass ration.
Rutherford’s nuclear model
used scattering of alpha particles through gold foil. found that the atom is mostly empty space surrounding a positive nucleus
Bohr’s energy level model
evidence that electrons can only be found in certain energy levels can be found from absorption and emission spectra. the atom is quantized
wave mechanical model
de-Broglie and others used the idea of electron as a wave to develop this
absorption spectra occur when
an electron goes up on an energy diagram
emission spectra occur when
electrons go down on an energy diagram
nuclear activity
the amount of radiation produced in a given time. it depends on the stability and amount of the substance
beta negative decay
occurs when a neutron changes into a proton and an antineutrino. High speed electrons
beta positive decay
occurs when a proton changes into a neutron and a neutrino
what is conserved in nuclear reactions
nucleons, charge, and mass-energy
fission
when a large nucleus is split into two daughter nulei
fusion
the combining of small atomic nuclei to make a heavier element
when is a moving electron considered beta radiation
when it is produced through a nuclear process
positive and negative particles curve in
opposite direction
what are quarks
fundamental particle that have fractional charges
