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20 Cards in this Set
- Front
- Back
Atomic Mass
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The average mass of all the isotopes of an element. Can be found below the element' s name on the periodic table.
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Chemical Symbol
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A one or two letter representation of an element.
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Group
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Elements in the same vertical column of the periodic table; also called family. The elements in each group share the same characteristics and the same number of valence electrons.
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Periodic Table
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An arrangement of elements showing the repeating patter of their properties.
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Period
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A horizontal row of elements in the periodic table. Elements in the same period have the same number of electron shells.
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Metals
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A class of elements characterized by physical and chemical properties that include shininess, malleability, and conductivity.
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Nonmetals
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An element that lacks the properties of a metal.
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Metalloids
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An element that has some characteristics of both metals and nonmetals.
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Noble Gas
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An element found in Group 18 of the periodic table.
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Halogen
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An element found in Group 17 of the periodic table.
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Family
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Elements in the same vertical column of the periodic table; also called a group. The elements in each family share the same characteristics and the same number of valence electrons.
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Density
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The ratio of the mass of a substance to its volume. (mass divided by volume).
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Dmitri Mendeleev
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He created the first periodic table. Mendeleev arranged the elements in order of increasing atomic mass. He even predicted elements that would be discovered in the future.
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Reactivity
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The ease and speed with which an element combines or reacts with other elements.
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Properties
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The things that distinguish the differences between elements. These can be physical like boiling and melting point or chemical like an elements re-activity.
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Ductile
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The ability of a material to be easily drawn into the shape of a wire.
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Conductivity
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The ability of an element or material to transfer heat or electricity.
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Malleable
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Used to describe material that can be hammered or rolled into sheets.
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Valence Electrons
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The electrons that are most loosely held by the atom and the ones that are involved in chemical reactions. Atoms of elements in a group on the Periodic Table have similar chemical properties. This similarity is most closely related to the atoms’ valence electrons
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Chemical Reaction
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Chemical reactions occur whenever valence electrons are shared or transferred between atoms.
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