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