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Inside the Atom Inside the Atom 1. nucleus: dense core contains neutral neutrons (n0) and positive protons (p+) 1. nucleus: dense core contains neutral neutrons (n0) and positive protons (p+) 2. energy levels: regions of space surrounding the nucleus. contain negative electrons(e-) 2. energy levels: regions of space surrounding the nucleus. contain negative electrons(e-) Atoms are measured in atomic mass units (amu) or grams per mole (g/mol). Atoms are measured in atomic mass units (amu) or grams per mole (g/mol). Most of the mass of an atom is in the nucleus. (p+ and n0 are ~2000X greater than the mass of e-) Most of the mass of an atom is in the nucleus. (p+ and n0 are ~2000X greater than the mass of e-) ***number of protons = atomic number ***number of protons = number of electrons (if the atom is neutral) ***number of protons + number of neutrons = atomic mass 8 O Oxygen 15.999 atomic number chemical symbol chemical name atomic mass ***number of protons = atomic number ***number of protons = number of electrons (if the atom is neutral) ***number of protons + number of neutrons = atomic mass 8 O Oxygen 15.999 atomic number chemical symbol chemical name atomic mass