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atom
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the basic unit of matter
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Terms in this set (16)
atom
the basic unit of matter
proton
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
neutron
A subatomic particle that has no charge and that is found in the nucleus of an atom
electron
A subatomic particle that has a negative charge
electron cloud model
model of atom in which the electrons seem to form a cloud as they move around the nucleus
Why are atoms electrically neutral?
A normal atom has a neutral charge because of the equal numbers of positive and negative particles that cancel each other out.
electron shells
An energy level representing the distance of an electron from the nucleus of an atom.
atomic number
the number of protons in the nucleus of an atom
symbol
A one or two letter abbreviation for an element
amu
abbreviation for atomic mass unit
atomic mass
The average mass of all the isotopes of an element
mass number
the sum of the number of neutrons and protons in an atomic nucleus
element name
the scientific name of an element
What subatomic particle determines the type of element (atomic number)?
proton
quarks
smaller particles that make up protons and neutrons
