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INtro to matter vocab atom ★ The basic unit of all matter ★ The smallest unit of an element consisting of protons, neutrons, and electrons Matter ★ Anything that has mass and takes up space Periodic Table ★ Contains almost 120 known elements ★ A large grid organized into rows and columns Element ★ Elements are identified by the number of protons ★ Atoms with specific characteristics Electron ★ Found whizzing around nucleus in areas called orbits ★ Small ★ Have a negative charge Neutron ★ Larger ★ Found in the nucleus of an atom ★ Have a neutral charge or a charge of zero ★ Atomic mass - atomic # = # of neutrons Proton ★ Larger ★ Found in the nucleus of an atom ★ Have a positive charge ★ # of protons = atomic #