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15 Cards in this Set

  • Front
  • Back
what defines the element
number of protons in the nucleus is called what
atomic number
what is the symbol for atomic number
a one or two letter abbreviation for the element that appears directly below its atomic number on the periodic table
chemical symbol
who came up w/ the periodic table
what is the periodic law
when elements are arranged in order of increasing relative mass, certain sets of properties recur periodically
Mendeleev listed the elements on the periodic table according to what
increasing atomic number
Mendeleev's periodic law was based on what
describe metals
-good conductors of heat
=tend to lose electrons
describe nonmetals
- solids at room temp.
-poor conductors of heat
-tend to gain electrons
describe metalloids
-also called semiconductors
-intermediate electrical conductivity can be changed & controlled
what is a family or column on the periodic table
each column within the main group elements in the periodic table
where are the noble gases located and describe their reactivness
-group 8A
-chemically inert
where are the alkali metals located and describe their reactivness
-group 1A
-very reactive
where are the alkaline earth metals located and describe their reactivness
-group A2
-fairly reactive