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Physical Science Chap. 17 Properties of Atoms and the Periodic Table

Glencoe Physical Science 2005

atomthe smallest particle of an element that still retains the properties of the element
nucleuspositively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons
protonparticle, composed of quarks, inside the nucleus of an atom that has a charge of 1+
neutronneutral particle, composed of quarks, inside the nucleus of an atom
electronparticles surrounding the center of an atom that have a charge of 1-
quarkparticles of matter that make up protons and neutrons
electron cloudarea around the nucleus of an atom where the atom's electrons are most likely to be found
atomic numbernumber of protons in an atom's nucleus
mass numbersum of the number of protons and neutrons in an atom's nucleus
isotopeatoms of the same element that have different numbers of neutrons
average atomic massweighted-average mass of the mixture of an element's isotopes
periodic tableorganized list of all known elements that are arranged by increasing atomic number and by changes in chemical and physical properties
groupvertical column in the periodic table
electron dot diagramuses the symbol for an element and dots representing the number of electrons in the element's outer energy level
periodhorizontal row in the periodic table

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