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(chemistry) a chemical reaction
This chemical reaction is very dangerous.
an overreaction
She overreacted to his words.
nuclear reaction
Nuclear reactions are used for mass production of energy.
overreaction
I was surprised by his overreaction.
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 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.
atomic weight
The atomic weight of helium is 4.
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