Flashcards About Elements –
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Windows Recovery Environment (Windows RE)
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A lean operating system installed on the Windows 8/7/Vista setup DVD and also on the Windows 8/7 volume that can be used to troubleshoot problems when Windows refuses to start.
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Atom
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is the smallest piece of an element that still represents that element
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Electrons
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is particle with one negative charge
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Proton
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is an atomic particle that has one positive charge.
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Neutron
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is a neutral particle that exists nucleus of atom
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Nucleus
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most of an atoms mass and positive charge is concentrated in a small area in the center of an atom
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Electron Cloud
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is an area around an atomic nucleus where an electron is most likely to be located.
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Atomic number
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number of protons in an atom of an element.
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Isotopes
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are atoms of the same element that have different numbers of neutrons. Most elements have several isotopes.
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Mass Number
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s the sum of the number of protons and neutrons in an atom. Mass number= # of protons + # of neutrons.
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Average atomic mass
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s the average mass of the element's isotopes, weighted according to the abundance of each isotope.
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Ion
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is an atom that is no longer neutral because it has gained or lost electrons.
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Metals
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often shiny, good conductors of electricity and thermal energy:easily pulled into wires and hammered into sheets.
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Matalloids
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have properties in common with both metals and nonmetals often used as semiconductors in electronic devices.
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Nonmetals
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poor conductors of thermal energy and electricity, most are gases at room temperature: solid forms tends to be brittle.
