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Ch. 3 Atoms Review

TermDefinition
Proton Found inside the nucleus. Positive charge.
Neutron Found inside the nucleus. Neutral.
Electron Found spinning around the nucleus. Negative charge.
Nucleus Center of the atom. Contains 99.9% of an atom's mass.
Valence Electrons Electrons furthest away from the nucleus. Determine whether or not an atom bonds with another.
Atomic Number The number of protons in an atom's nucleus.
Atomic Mass The number of protons and neutrons in an atom's nucleus.
Groups Vertical (up and down) columns in the periodic table.
Periods Horizontal rows in the periodic table.
Metals Left side of periodic table.
Properties of Metals Shiny, malleable, good conductors.
Properties of Nonmetals Dull, brittle, poor conductors. Many are liquids or gases.
Nonmetals Right side of periodic table.
Transition Metals Groups 3-12. Shiny, stable, good conductors.
Metalloids Share properties of metals and nonmetals.
Noble Gases Group 18. Nonreactive; have all of the valence electrons they need.
Isotopes Atoms of the same element with different numbers of neutrons.
Created by: Mr.O'Brien
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