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the number of protons in the nucleus of an atom, which determines which element it is. In a neutral atom, the atomic number is also equal to the number of electrons surrounding the atom.
the simplest type of pure substance that cannot be broken down into simpler components.
reactions in which an atom or group of atoms is replaced in a molecule by another atom or group...
the phase change of a substance from the gas phase to the solid phase, without passing through...
a crystal lattice of positive kernels in a sea of delocalised electrons to which they are...