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radioactive element
Radioactive elements are produced in nature and scientific experiments.
(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.
atomicity
Database transactions need to ensure their atomicity.
being radioactive
This rock is radioactive, so care must be taken when handling it.
californium
Californium is a radioactive chemical element with an atomic number of 98.
(chemistry) element, chemical element
Hydrogen is the most abundant element in the universe.
sex, gender / (grammar) gender
Education about sex is very important.
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.
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