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(chemistry) chemical element
Oxygen, which is one of the chemical elements, is necessary for us to breathe.
antimony
Antimony is one of the chemical elements, and its symbol is Sb.
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.
symbol, mark
What does this symbol mean?
He is an expert in chemistry.
first, initial / one-eyed
This is my first question.
(chemistry) rare earth elements
Rare earth elements are essential materials for the manufacture of electronic devices.
an isotope
An isotope refers to elements with the same atomic number but different numbers of neutrons.
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