EVERYDAY SCIENCE

Detailed explanation-1: -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.

Detailed explanation-2: -Hydrogen is the most abundant element in the universe and oxygen is the most abundant gas in the earth’s crust. Hydrogen is the main component in the sun and the stars. It is present in very small quantities in the air.

Detailed explanation-3: -Hydrogen is easily the most abundant element in the universe. It is found in the sun and most of the stars, and the planet Jupiter is composed mostly of hydrogen. On Earth, hydrogen is found in the greatest quantities as water.

Detailed explanation-4: -Hydrogen has one proton, one electron and is the only element with no neutrons, making it the simplest element in the universe. Because of this, Hydrogen is believed to be the most abundant element, accounting for about 90% of the visible universe.

Detailed explanation-5: -Hydrogen and oxygen are considered as elements which cannot split into different substances by applying any kind of energy like heat or electricity whereas water is a composed of constituents like hydrogen and oxygen in a fixed proportion and it can be split up by applying energy.