list all the characterstics of hydrogen
the first element to appear on the Periodic Table of Elements
in its gaseous state at room temperature
considered the smallest, lightest and simplest element known
the most abundant element in the universe
the word hydrogen means "water-former"
when it is isolated from other substances, it exixts as a pair of hydrogen atoms linked together by means of the covalent bond
pure molecular hydrogen is a colorless, odorless, and tasteless gas