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the sum of the number of protons and neutrons (the nucleons) in the nucleus of an atom. It determines the mass of the element.
a material that has intermediate electrical conductivity that can be changed and controlled. It...
an ion that does not take part in the reaction but is present in the reaction mixture throughout...
types of chemical âunitsâ â could be atoms, molecules, molecular fragments, simple or...
the theory whereby molecules undergo effective collisions to form new molecules.