hydrogen vs. atomic bomb

hydrogen

[hahy-druh-juhn] / ˈhaɪ drə dʒən /

noun

a colorless, odorless, flammable gas that combines chemically with oxygen to form water: the lightest of the known elements. H; 1.00797; 1; density: 0.0899 grams/liter at 0°C and 760 millimeters pressure.

atomic bomb

[uh-tom-ik bom] / əˈtɒm ɪk ˌbɒm /

Also atom bomb

a bomb whose potency is derived from nuclear fission of atoms of fissionable material with the consequent conversion of part of their mass into energy.
a bomb whose explosive force comes from a chain reaction based on nuclear fission in U-235 or plutonium.