no
yes
non-metal..
the number of hydrogen is 4.0
it bonds with oxygen and fluoride
21
carbon mostly and hyrogen
The name "hydrogen" comes from the Greek words "hydro" meaning water and "genes" meaning forming. This is because hydrogen, when burned, combines with oxygen in the air to form water.
It could be done, yes.
Each H atom has one proton in its nucleus.
Nuclear fusion of hyrogen nuclei (protons) to produce helium
No, hydrochloric acid contains hyrogen and chlorine, so therefore it is not an element.