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15 Cards in this Set

  • Front
  • Back
period
horizontal rows that show repeating chemical and physical characteristics
family
elements in same vertical column
metals
solid, shiny, very reactive
good conductors of heat and electricity. Ex) iron, copper
nonmetals
easily crushed, no shine or luster
poor conductors of heat and electricity
metalloids
have properties of metals and nonmetals, dull in color, not malleable or ductile,semiconductors
periodic table
Mendeleev discovered the table of elements, repeating pattern
atomic number
number of protons, elements put in order of their atomic number
mass number
the sum of protons and neutrons
isotope
atoms of the same element with a different number of neutrons. C-12, C-14, Boron
atomic mass
average mass of the isotopes of an element found in nature. Decimal number under the symbol.
alkali metals
column I soft and can be cut with knife, malleable,
very reactive, metallic luster, conducts heat and electricity
alkaline earth metals
column II not as reactive
beryllium, magnesium, calcium
ion
when an element gains or loses an electron it becomes an ion
malleable
elements(metals) that can be pounded or rolled into sheets.
ductile
elements(metals)that can be pulled into wires.