There are two different isotopes of chlorine and these are ³⁵Cl (abundance = 75.78 %) and ³⁷Cl (abundance = 24.22 %). Under a certain condition, a mass spectrum of Cl₂ consists of three peaks (Peak 1 - 69.938 u, Peak 2 - 71.935 u, and Peak 3 - 73.932 u) with a relative abundance ratio of 9:6:1. Determine which two atoms comprising a Cl₂ molecule gave each peak.