Question

Properties of hydrogen gas

Answer 1

Hydrogen is the lightest element and will explode at concentrations ranging from 4-75 percent by volume in the presence of sunlight, a flame, or a spark.
Despite its stability, hydrogen forms many bonds and is present in many different compounds.
Three naturally occurring isotopes of hydrogen exist: protium, deuterium, and tritium, each with different properties due to the difference in the number of neutrons in the nucleus.