With an atomic weight of u, hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the universe, constituting roughly % of all baryonic mass. The above shows the energy change when a hydrogen molecule is formed. Which of the following statements is correct?
Hydrogen is a chemical element with chemical symbol H and atomic number
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
No explanations have been posted yet. Check back later!