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22 Cards in this Set
- Front
- Back
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atom |
smallest piece of an element that still represents that element |
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electron
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particle with a negative charge |
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neutron |
a neutral particle that exists in the nucleus of an atom |
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proton |
particle with a positive charge |
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nucleus |
contains most of the atom's mass and has a positive charge; center of the atom; contains protons and neutrons |
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electron cloud |
an area around an atomic nucleus where an electron is most likely to be located |
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atomic number |
the number of protons in the nucleus of an atom |
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isotope |
atoms of the same element that have different numbers of neutrons |
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mass number |
the sum of the number of protons and neutrons in an atom |
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average atomic mass |
the average mass of the element's isotopes, weighted according to the abundance of each isotope |
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periodic table |
a chart of the elements arranged into rows and columns according to their atomic number and physical and chemical properties |
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ion |
an atom that is no longer neutral because it has gained or lost electrons |
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group |
column on the periodic table |
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period |
rows on the periodic table |
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metal |
an element that is generally shiny; mostly on left side of periodic table; good conductor of heat and electricity; easily pulled into wires and hammered into thin sheets |
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luster |
the ability of a metal to reflect light |
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malleability |
the ability of a substance to be hammered or rolled into sheets |
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ductility |
the ability to be pulled into thin wires |
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nonmetal |
elements that have no metallic properties; mostly located on the right side of table |
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noble gas |
elements in group 18; stable; the least reactive group of metals and nonmetals |
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metalloid |
an element that has physical and chemical properties of both metals and nonmetals |
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semiconductors |
conducts electricity at high temperatures, but not at low temperatures |
