Chapter 4: Classifying Elements

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symbol
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Terms in this set (22)
symbol
one or two letters that represent the name of an element
periodic table
an arrangement of elements by increasing atomic number
Image: periodic table
isotope
one of a group of atoms of an element with the same number of protons and electrons but different numbers of neutrons
Image: isotope
deuterium
an isotope of hydrogen that has one proton and one neutron
Image: deuterium
tritium
an isotope of hydrogen that has one proton and two neutrons
Image: tritium
atomic mass
the average mass of all the isotopes of a particular element
Image: atomic mass
family
a group of elements with similar properties, arranged together in a column of the periodic table
Image: family
metal
one of a group of elements that is usually solid at room temperature, often shiny, and carries heat and electricity well
Image: metal
alloy
a mixture of two or more metals
Image: alloy
nonmetal
one of a group of elements with properties unlike those of metals
Image: nonmetal
noble gasone of a group of elements made up of gases that do not combine with other materials under ordinary circumstancesinertinactive; lacking power to moveEach element has asymbolAll elements are in order on the periodic table by...atomic numbersisotopes of the same element have the same number ofprotons and electronsElements are classified as...metals, nonmetals, or noble gasesMost metals are ______ at room temperaturesolidThe shape of a metal can bechangedelectricity and heat travel well throughmetalsmost nonmetals aresolids or gases at room temperaturenonmetals have opposite properties ofmetalsnoble gases are called _________________ because they do not ordinarily react or combine with other elements.inert