Oxygen ( O ) has three naturally occurring isotopes: 16 O ,
17 O , and 18 O .
16 O is the most abundant isotope with an abundance of 99.757 % and an isotopic mass of 15.995 u. The second most abundant isotope is 18 O with an abundance of 0.205 % and an isotopic mass of 17.999 u. The least abundant isotope, 17 O , has an abundance of only 0.038 % and an isotopic mass of 16.999 u.
Three cards with holes are arranged in a straight line. a light is shined through the first cardβs hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line
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