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CDA- 17 Vocabulary
N/A
24
Science
8th Grade
02/18/2010

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Term
Alkali metals
Definition
Group 1 elements that each have one valence electron
Term
Alkaline-earth metals
Definition
Group 2 elements that each have 2 valence electrons
Term
Alloy
Definition
a homogeneous mixture of metals
Term
Ductile
Definition
capable of being drawn into wire
Term
Electron configuration
Definition
the number and position of electrons in the energy levels of an atom
Term
Electronegativity
Definition
the relative ability of an atom to attract electrons in a chemical bond
Term
Family
Definition
a vertical column in the Periodic Table
Term
Group
Definition
another name for "family" in the Periodic Table
Term
Halogens
Definition
reactive elements in Group 17 that have seven valence electrons
Term
Luster
Definition
sheen, brightness, brilliance or radiance of light
Term
Malleable
Definition
capable of being hammered of rolled
Term
Metalloids
Definition
a substance that has properties of both metals and nonmetals
Term
Metals
Definition
an element that tends to give up electrons in chemical reactions
Term
Noble gases
Definition
stable elements found in Group 18 that have eight valence electrons
Term
Nonmetals
Definition
an element that tends to gain an electron in a chemical reaction; poor conductor of heat and electricity
Term
Octet Rule
Definition
atoms are most stable if they have filled or empty outer layer of electrons
Term
Period
Definition
a horizontal row in the Periodic Table; defines the total number of energy levels
Term
Periodic Law
Definition
the chemical properties of the elements are periodic functions of their atomic numbers
Term
Periodic Table
Definition
a table of elements arranged by atomic number into vertical columns called families or groups, and horizontal rows called periods
Term
Semiconductor
Definition
a substance that holds its electrons in a way that allows a partial flow of electricity
Term
Series
Definition
a period or row in the Periodic Table
Term
Transition elements
Definition
strong metals in Groups 3-12
Term
Transuranium elements
Definition
an element with an atomic number higher than that of uranium
Term
Valence electrons
Definition
the electrons in the outermost energy level
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