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KOTELCHEMMODULE3

KOTEL CHEMISTRY MODULE 3 VOCABULARY

QuestionAnswer
proposed in 1803 as the result of performing numerous chemical reactions, and making observations and measurements which gave mass rations describing how many atoms of each element made up a compound Dalton's Atomic Theory
the smallest particle of matter that retains the properties of the element atom
a ray originating at the cathode and traveling to the anode cathode ray
negatively charged particle that is a part of all forms of matter electron
dense region in the center of an atom nucleus
subatomic particle carrying a charge equal to but opposite that of an electron proton
a subatomic particle that has a mass nearly equal to that of a proton but carries no electric charge neutron
the number of protons in an atom atomic number
atoms with the same number of protons but different numbers of neutrons isotopes
identifies each isotope of an element and is the sum of the protons and neutrons in the nucleus mass number
one twelfth the mass of a carbon-12 atom atomic mass unit (amu)
the weighted average mass of the isotopes of that element atomic mass
process by which energy that is spontaneously given off by some substances radioactivity
rays and particles emitted by radioactive material radiation
a reaction that involves a change in an atom's nucleus nuclear reaction
spontaneous process by which unstable nuclei lose energy by emitting radiation radioactive decay
made up of two protons and two neutrons with a +2 charge alpha particle
represent radioactive decay by showing atomic numbers and mass numbers of the particles involved nuclear equation
made of an electron with a -1 charge beta particle
high-energy radiation that has no mass gamma ray
Created by: CRMissK
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