Which element, with the atomic number 1, is the lightest and most abundant element in the universe?

Explanation

Hydrogen, with the atomic number 1, is the lightest and most abundant element in the observable universe, making up the majority of stars, including our sun, through nuclear fusion reactions. On Earth, hydrogen is rarely found in its pure elemental gas form and is more commonly found combined with other elements, such as in water. Hydrogen is also being explored as a clean fuel source, since burning it produces water vapor rather than carbon-based emissions. Explore more Everyday Science MCQs on mcqstutor to keep practicing.