isotopes 1 Flashcards

1
Q

definition of isotope

A

atom of the same element that the same p+ and e- but a different n

stable : do not decay
radioactive: decay spontaneously

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2
Q

stable isotopes uses

A
  • isotope fractionation gives info about geoX processes taking place in a syst
  • trace origine of elts from diff sources
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3
Q

radioactive isotopes uses

A
  • used to trace the origin of elts from diff sources
  • used to date geological materials (age)
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4
Q

vibration frequency of atoms

A

lower for heavy atoms (stronger bond)
higher for light atoms (weak bond)

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5
Q

differences btw light and heavy isotopes

A

isotopes in gases : light diffuse faster and more reactive than heavy

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6
Q

isotope fractionation

A

cause a change in relative proportions btw isotopes

independant of dilution!

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7
Q

biochemical processes that affect isotope fractionation

A

-redix transformation
complexation
sorption
precipitation
dissolution
evaporation
diffusion
biological cycling

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8
Q

description of isotope data

A

a=Ra/Rb
=(deltaA+1000)/(deltaB+1000)

deltaR=(Rsample/Rstandart-1)*1000

assumptions a : isotopic eq btw phases, in ocean evap and cond=, cst T°

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