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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.
hafnium
Hafnium is a chemical element with atomic number 72.
(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.
number
Could you tell me your number?
(physics, chemistry) atom
Understanding the structure of atoms is a fundamental part of physics.
He is an expert in chemistry.
(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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