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unit 2-section 1

vocab words

Atom the smallest particle of an element that can exist alone or in combination
Neutron a particle that has a mass nearly equal to that of the proton but no electrical charge is present in all atomic nuclei except those of hydrogen
Proton a very small particle that occurs in the nucleus of every atom and has a positive charge of electricity
Electron a very small particle that has a negative charge of electricity and travels around the nucleus of an atom
Ion an atom or group of atoms that carries an electric charge
Isotope any of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties
Atomic number an experiemntally determined number characteristic of a chemical element that represents the number of electrons outside the nucleus and that determines the place of the element in the periodic table
Nucleons protons or neutrons in the atomic nucleus
Nuclide a species of atom charcterized by the constitution of its nucleus and hence by teh number of protons, the number of neutrons, and the energy content
Mass number an integer that expresses the mass of an isotope and designates the number of nucleons in the nucleus
John Dalton developed the Atomic theory
JJ Thompson discovered the electron using the Cathode Ray Tube
Democritus viewed matter as made of smaller particles
Ernest Rutherford discovered the existence of nucleus using the Gold Foil Experiment
Neils Bohr developed the planetary model
James Chadwick discovered the neutron
Robert Millikan discovered the electron charge and mass of an electron using the Oil Drop Experiment
Created by: 375princess



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