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chpt 4 vocab
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smallest particle of an element that retains its identity in a chemical reaction
atom
weighted average of the masses of the isotopes of an element
atomic mass
unit of mass equal to one-twelfth the mass of a carbon-12 atom
atomic mass unit
number of protons in the nucleus of an atom of an element
atomic number
stream of electrons produced at the negative electrode of a tube containing a gas at low pressure
cathode ray
first theory to relate chemical changes to events at the atomic level
Dalton's atomic theory
negatively charged subatomic particle
electron
veritcal column of elements in a periodic table
group
atoms of the same element that have the same atomic # but different atomic masses due to a different # of neautrons
isotopes
total # of protons with no charge and a mass of 1 amu
mass number
subatomic particle with no charge and a mass of 1 amu
nuetron
tiny, dense central portion of an atom, composed of protons and neutrons
nucleus
horizontal row of elements in the peroidic table
period
arrangement of elements in which the elements are seperated into groups based on a set of repeating properties
periodic table
positively charged subatomic particle found in the neucleus of an atom
proton
Author
Anonymous
ID
45196
Card Set
chpt 4 vocab
Description
chpt 4 chemisrty vocab
Updated
2010-10-26T21:11:42Z
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