Examlex
Specialization arises because
Atomic Number
The atomic number is equal to the number of protons (positively charged particles) in the nucleus of an atom.
Element
A pure chemical substance consisting of one type of atom distinguished by its atomic number.
Nucleus
The central and most important part of an atom, containing protons and neutrons and almost all of its mass.
Matter
Anything that occupies space and has mass, composed of atoms or molecules and is the substance that makes up the physical universe.
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