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a group of atoms that are bonded together. It has an unequal number of protons and electrons and therefore carries a charge.
forms between two atoms if the two atoms share six electrons.
a process that takes energy into the system. This increases the internal energy of the system (...
two species that differ from each other by a single proton (H+ ion). An acid becomes its...
small electrical cells such as those in watches, pacemakers, hearing aids and calculators.