The building and structure unit of all matter is, Atoms, Clay bricks, Molecules, Cell, The subatomic particles that make up the nucleus is, Proton and electron, Neutrons and electrons, Protons and neutrons, Protons,electrons and neutrons, What is the subatomic component that has the smallest mass, Protons, Neutrons, Electron, Nucleus, Which of the following subatomic components has a mass 1u, Proton only, Electron only, Each of neutron and proton, Each of Electron and neutrons, Limestone rocks is composed of molecules of, Calcium oxide, Calcium carbonate, Calcium nitrate, Calcium phosphate

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