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SSC CHSL 2020 PYQ — Question 43

SSC CHSL - 14th October 2020 - Shift 2 • General Awareness • Q43

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Which of the following elements occurs most abundantly in our universe?

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Correct answer: B

Explanation

The correct answer is option 2 i.e. Hydrogen.

  • The abundance of the chemical elements is a measure of the occurrence of the chemical elements relative to all other elements in a given environment. Abundance is measured in one of three ways: by the mass-fraction (the same as weight fraction); by the mole-fraction (fraction of atoms by numerical count, or sometimes a fraction of molecules in gases); or by the volume-fraction. 
  • 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.