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Chem Test - atomic

beginning of atomic theory

QuestionAnswer
Moseley discovered that all atoms of an element have the same number of protons
In a single neutral atom the number of protons equals the number of electrons
Ion an atom that has lost or gained electrons
The average mass of an element's atoms atomic mass
1 AMU equals 1 / 12 the mass of a carbon-12 atom
isotopes atoms with the same number of protons but a different number of neutrons
How do you calculate the charge of an atom? protons minus electrons
What lead to idea that cathode rays had neg charged particles? the magnet..
Thomson figured out the charge to mass ratio
Miliken found the charge of a single electron
Becquerel figured out natural radioactivity with the crystals. used radium and pulonium in experiments
Thomoson's Model grapes in jello, positively charged with negative charge in it, did not know how they arranged
Rutherford developed nuclear model of atom
rutherford 2 gold foil --> nucleus
Types of radiation alpha, gamma, beta
alpha positive (4amu)
beta negative (1amu) electron
gamma radiation
Michael Faraday suggested structure of atom somehow related to electricity
Cathode negative
Anode positive
Henri Becquerel discovered radioactivity while working with uranium
charge of a nucleus positive
static electricity electric charges that are not in motion
cathode ray stream of particles orginating from a cathode
coulomb SI unit of electrical charge = 1 electron
radioactivity spontaneous emission of radiation from an element
gamma radiation radiation similar to xrays that is not composed of particles
alpha particle particle with +2 charge emitted by radioactive elements
oil drop done by miliken, measures the charge of a single electron
law of multiple proportions (blank)
Created by: 07adelmanl
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