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Hydrogen is the most abundant element in the Universe; helium is second. However, after this, the rank of abundance does not continue to correspond to the atomic number; oxygen has abundance rank 3, but atomic number 8. All others are substantially less common.
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IIFT Averages Mixtures Alligations
IIFT Functions, Graphs and Statistics
IIFT Logarithms, Surds and Indices
IIFT Averages, Ratio and Proportion
IIFT DI with connected data sets
IIFT Grammar and Sentence Correction
IIFT Simple Interest Compound Interest
IIFT Probability, Combinatorics