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(chemistry) rare earth elements
Rare earth elements are essential materials for the manufacture of electronic devices.
a transition element
Transition elements play an important role in chemical reactions.
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.
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.
telephone number
What is my telephone number?
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