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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.
a group of elements between the metals and the non-metals. They are semiconductors and have some...
reactant molecules are in contact with the solid catalyst.
a group of organic compounds having a triple bond between two carbons.
chemical calculations that involve amounts of different chemicals.