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Glossary of physical science chp. 7

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periods
a horizontal row in the periodic table, also called a series
electron configuration
the number and position of electrons in the energy levels of an atom
metal
an element that tends to give up electrons in a chemical reaction
group
another name for a family on the periodic table
valence electrons
the electrons in the outermost energy level of an atom
metalloid
a substance that has properties of both metals and nonmetals
family
a vertical column on the periodic table; also called a group
nonmetal
an element that tends to gain electrons in a chemical reaction; a poor conductor of heat and electricity
malleable
capable of being hammered or rolled
alloys
a homogeneous mixture of metals
luster
shining by reflecting light
transuranium element
an element with an atomic number higher than that of uranium
alkali metals
Group 1 (IA) elements that each have one valence electron
ductile
capable of being drawn into wire
noble gases
stable elements found in Group 18 (VIIIA) that have eight valence electrons
transition elements
strong metals in Groups 3-12
(IB through VIIIB)
periodic table
a table of the elements arranged by atomic number into vertical columns called families or groups, and horizontal rows called periods
periodic law
the chemical properties of the elements are periodic functions of their atomic number
halogens
reactive elements in Group 17 (VIIA) that have seven valence electrons

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