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Isotopes
Higher
2 marks
Chlorine has two isotopes: 35Cl (75%) and 37Cl (25%). Calculate the relative atomic mass.
A
Ar = (35 × 75 + 37 × 25) / 100 = 35.5
B
Ar = (35 + 37) / 2 = 36.0
C
Ar = 37 (mass of heavier isotope)
D
Ar = 35 (mass of lighter isotope)
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