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20 Cards in this Set

  • Front
  • Back
chemical elements
substance that cannot be
split in simpler substance
how many elements
112 element 92 occur
naturally
chemical symbol
1 or 2 letters in
english, latin, or
another language
H, C,O,N,Ca,Na
hydrogen, carbon, oxygen,
nitrogen, calcium, sodium
elements in body
26
96% of elements
oxygen, carbon,
hydrogen, nitrogen
8 other elements present
in body
calcium, phosphorus, potassium,
sulfur, sodium, chlorine,
magnesium, iron
how many additional
elements
14 trace elements
.2%
atoms
smallest units
of matter that
retain properties
of element
subatomic particles
protons, neutrons,
electrons
nucleus
dense central
core of atom
electron shells
electron moving
about central
core
1st 2nd 3rd + shells
2, 8, 18, 18
most massive
element
iodine
electrons equal
protons
atomic #
# of protons
mass #
sum of protons
and neutrons
isotopes
different # of
neutrons
radioactive isotopes
unstable nuclei
decay(change) into
stable
half-life
time required for half
of radioactive atoms to
decay into stable form