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(physics, chemistry) atomic number
The atomic number of helium is 2.
atomicity
Database transactions need to ensure their atomicity.
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.
atomic weight
The atomic weight of helium is 4.
nuclear fission
Nuclear fission is a powerful phenomenon that generates energy.
Kyūjitai form of 原子炉 (“nuclear reactor”)
This nuclear reactor is designed to be very safe.
(weaponry) hydrogen bomb
He was involved in the development of the hydrogen bomb.
hydrogen sulphide
Hydrogen sulphide is extremely toxic, and particularly at high concentrations, it is lethal to humans.
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