Glossary of Chemistry Chapter 4 and 5 Vocab

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Conversion factor
a ratio of equivalent measurements used to convert a quantity fromone unit to another
Dimensional Analysis
a technique of problem solving that uses the units that are part ofa measurement to help solve the problem
Alkali Metal
any metal in group 1A of the periodic table
Alkaline earth Metals
Any metal in groups 2A of the periodic table
the smallest particle of an element that retains the properties ofthat element
Atomic Mass
the weighted average of the masses of the isotopes of an element
atomic mass unit (amu)
a unit of mass equal to one twelfth the mass of a carbon-12 atom
Atomic Number
The number of protons in the nucleus of an atom of an element
Cathode Ray
a stream of electrons produced at the negative electrode (cathode)of a tube containing a gas at low pressure
Dalton's Atomic Theory
the first theory to relate chemical changes to events at the atomiclevel
a negatively charged subatomic particle
a vertical column of elements in the periodic table; the constituentelements of a group have similar chemical and physical properties
any member of the non-metallic elements in Group 7A of the periodictable
Inner Transition Metal
an element on the lanthanide and actinide series; characterized byaddition of electrons to f orbi
atoms of the same element that have the same atomic number butdifferent atomic masses sue to a different number of neutrons
Mass Number
the total number of protons and neutrons in the nucleus of an atom
one of a class of elements that includes a large majority of theknows elements, metals are characteristically lustrous, malleable,ductile, and good conductors of heat and electricity
one of a class of elements having properties intermediate to metalsand nonmetals
a subatomic particle with no charge and a mass of 1 amu; found in the nucleus of the atom
noble gas
any member of a group of gaseous element in group 0 of the periodictable; the s and p sublevles of theiroutermost energy level are filled
one of a class of elements that are not lustrous and are generallypoor conductors of heat and electricity; non metals are grouped onthe right side of the periodic table
the dense central portion of an atom, composed of protons andneutrons
a horizontal row of elements on the periodic table
periodic law
when the elements are arranged in order of increasing atomic number,there is a periodic repetition of their physical and chemicalproperties
Periodic table
an arrangement of elements into rows and columns according tosimilarities in their properties
a positively charged subatomic particle found in the nucleus of anatom
Representative element
Group A element on the periodic table; together, these elementswhich have only partially filled outermost s and p sublevels, illustrate the entire range ofchemical properties
Transition metals
Group B element characterized by addition of electrons to d suborbitals

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