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(physics, chemistry) atomic number
The atomic number of helium is 2.
a valence
I learned about valence in chemistry class.
atomic bomb
We must not forget the horror of the atomic bomb.
atomic clock (not to be confused with radio clock)
He measures time accurately using an atomic clock.
(nuclear physics) a nuclear reactor
The safety of nuclear reactors is very important.
nuclear fission
Nuclear fission is a powerful phenomenon that generates energy.
atomic weight
The atomic weight of helium is 4.
hydrogenate
He hydrogenated fatty acids in a chemical experiment.
(chemistry) hydrogenation; hydride
This compound is stabilized by hydrogenation.
hydrogen sulphide
Hydrogen sulphide is extremely toxic, and particularly at high concentrations, it is lethal to humans.
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