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(physics, chemistry) atomic number
The atomic number of helium is 2.
(chemistry) chemical element
Oxygen, which is one of the chemical elements, is necessary for us to breathe.
(chemistry) thorium
Thorium is one of the chemical elements, its symbol is Th, and its atomic number is 90.
one thing
He ate one apple.
(chemistry) element, chemical element
Hydrogen is the most abundant element in the universe.
chemistry (branch of natural science)
He is majoring in chemistry at university.
(physics, chemistry) atom
Understanding the structure of atoms is a fundamental part of physics.
number
Could you tell me your number?
symbol, mark
What does this symbol mean?
He is an expert in chemistry.
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