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a group of atoms held together by chemical bonds.
horizontal tunnels that are dug from the working shaft to the ore body in a mine.
a group of organic compounds that can be represented by a general formula e.g. alkanes, alcohols...
the energy liberated when an electron is added to an isolated, neutral atom in the gaseous state...
a material that has intermediate electrical conductivity that can be changed and controlled. It...
centre part of an atom with positive charge concentrated in a tiny kernel.