- Physical Sciences
the sum of the number of protons and neutrons (the nucleons) in the nucleus of an atom. It determines the mass of the element.
bonds that form between the hydrogen atom of one molecule and an oxygen, nitrogen or fluorine...
the plastics converter industry uses polymers to manufacture useful everyday objects.
a relative measure of the mass contribution of each component in a compound. The percentage...
an acid-base reaction in which there is a transfer of protons.