chemistry 100
Terms
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- what defines the element
- proton
- number of protons in the nucleus is called what
- atomic number
- what is the symbol for atomic number
- Z
- 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
- Mendeleev
- 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
- observation
- describe metals
-
-good conductors of heat
-shiny
=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
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-group A2
-fairly reactive