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Atom
The smallest particle of an element that retains its identity in a chemical reaction
Scanning Tunneling Microscope
An instrument used to generate images of individual atoms
John Dalton
English Chemist and schoolteacher who formulated a theory to describe the structure and chemical reactivity of matter in terms of atoms
Democritus
Greek philosopher who was among the first to suggest the existence of atoms
Electrons
Negatively charged subatomic particles
Cathode Ray
stream of electrons produced at the negative electrode of a tube containing a gas at low pressure
Protons
Positively charged subatomic particles
Neutrons
Subatomic particles with no charge
Nucleus
the central core of an atom, which is composed of protons and neutrons
Atomic Number
the number of protons in the nucleus of an atom of an element
Periodic Table
an arrangement of elements according to similarities in their properties
Mass Number
equals the number of neutrons plus the number of protons in an atom
Group
A vertical column of elements in the periodic table
Isotopes
atoms that have the same number of protons but different numbers of neutrons
Atomic Mass Unit (amu)
1/12 the mass of a carbon-12atom
Atomic Mass
weighted average mass of the atoms in naturally occurring sample of an element
Period
A horizontal row of the periodic table
Author
Anonymous
ID
7769
Card Set
Chemistry
Description
Prentice Hall Chpt. 4
Updated
2010-02-23T01:33:49Z
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