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16 Cards in this Set
- Front
- Back
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Element
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- An element is a fundamental chemical substance
- Elements cannot be broken down by chemical means to a simpler substance - There are 118 known elements |
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Atom
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The smallest part of an element
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Group
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Elements within a group have similar properties
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Metals
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-lustrous
-malleable - high density and melting point - Conduct heat and electricity |
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Nonmetals
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- Dull
- Brittle - Poor conductors of heat and electricity - Low density and melting point |
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Metalloids
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They have properties that are intermediate between those of metals and those of nonmetals
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Diatomic molecules
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They each contain exactly two atoms
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Compound
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- Composed of two or more elements combined in a definite proportion by mass
- Each compound has unique properties that are different from the elements that make it up |
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Molecule
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- The smallest uncharged individual unit of a compound
- Usually composed of two or more nonmetals - Do not conduct electricity |
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Ion
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charged particles
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Cation
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positive ions
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Anion
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negative ions
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Chemical formula
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specifies the number of atoms of each element in the compound
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Subscripts
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Small number outside of parentheses in a compound that is written out
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Nobles gases
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the least reactive elements that are found in uncombined form
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Noble metals
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nonreactive and are found as elements in nature
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