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Naturally occurring lithium consists of 90% ( ^7_3Li text{ and 10% } ^6_3 Li. )…

Naturally occurring lithium consists of 90% ( ^7_3Li text{ and 10% } ^6_3 Li. ) What is the relative atomic mass of lithium?
  • A.
    6
  • B.
    6.8
  • C.
    6.9
  • D.
    7
  • E.
    7.1
Correct Answer: Option C
Explanation