What best describes a unit of mass that makes up the mass of an atom or molecule
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Atomic Mass Unit
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A chart of the elements showing the repeating pattern of their properties is a
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Periodic Table
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A column of the periodic table where elements share similar properties is a
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Group
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A subatomic particle that has a positive charge and that is found in the nucleus is a
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Proton
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The positively charged dense center of an atom is called a
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Nucleus
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The number of protons in an atom is the
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Atomic Number
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What subatomic particle has a negative charge
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Electron
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A row in the Periodic Table where single protons are added to each element is a
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Period
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A weighted average of the atomic masses for the isotopes of an element is
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Atomic Weight
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What kind of electrons are involved in forming bonds in the outermost shell
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Valence
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What type of atoms are the same element but have different numbers of neutrons
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Isotopes
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What is a negatively charged ion
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Anion
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What is the type of energy required to remove an electron from an atom
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Ionization energy
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What is a charged atom called
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An Ion
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What is the region of space around the nucleus where an electron is likely to be found called
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Orbital
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An atom's ability to attract and hold electrons is called
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Electronegativity
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A positively charged ion is
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A Cation
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What is a particle of electromagnetic radiation with no mass with a quantum of energy
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Photon
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