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nuclear bomb
The use of nuclear bombs is one of the greatest threats to mankind.
a valence
I learned about valence in chemistry class.
(physics, chemistry) atomic number
The atomic number of helium is 2.
atomicity
Database transactions need to ensure their atomicity.
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.
historic, historical / already-happened, past / former, old, traditional
This is a historic building.
historian
He is a famous historian and has written many history books.
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