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15 Cards in this Set

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Mendeleev
-made the 1st periodic table according to increasing atomic mass.
Periodic
means repeating
Periodic Law
properies of elements change periodically with the elements' atomic number
(Now the periodic rtable is set up by increasing atomic number)
family/group
8 columns of the periodic table; elements are similar in same family
Period
7 rows of the periodic table; elements are NOT eimilar in same period
Most of the elements are classified as
metals
the family/group # tells..
the # of electrons on the outer shell of an atom
Alkali metal 1
most reactive metals
alkaline earth metals @
not as reactive as alkali metals
halogens
most reactive non metals; salt formers'
noble gases
colorless, odorless gases; unreactive because they have a full outer shell of electrons
rare earth elements
at bottom of periodic table' most are man made and some radioactive
most abundant metal
aluminum
found in all living things
carbon
air is
80% nitrogen