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Chem 5/9

Democritus thought matter was composed of atoms
Rutherford Positively charged alpha particles are ions of helium
Transmutation conversion of one element to another by natural or artificial means
Tracers chem compound where 1+ atoms are replaced by a radioisotope
radioisotope atom with unstable nucleus
chain reaction products cause reaction to continue or magnify
Protium H-1
Deuterium H-2
tritium H-3
Dalton Revised concept of atom
ionizing radiation dislocate bonding electrons and create ions when passing through matter
transuranic elements follow uranium. atomic #'s greater than 92
fission heavy nuclide splits into 2
critical mass minimum quantity of an element needed to support a self-sustaining chain reaction
mass defect difference between mass of protons and neutrons and the mass of nucleus
Thomson showed exisistance of electron
fusion uniting 2 light elements to form heavier one
artificial nuclear rection disintegrate in definite fashion with specific half life
Created by: Ljg1237