concentrated in a small, dense regionNucleus (proton(s) and neutron(s)~10-18cmelectron: “orbits” the nucleuselectron: orbits the nucleus“multielectron atoms” have more than one e- “orbiting” the nucleus1013S. Ensign, Atomic structure & nomenclature13~10-13cmDiameter of atom ~ 10-8cm (~1-5 Å)The electron is ~1000 times smaller in size than the proton, but occupies a space ~10,000-100,000 times greater than the size of the nucleusGolf ball nucleus on 50 yard line(2 cm diameter)The stadium ( 200 m diameter) represents the space in which the electron(s) reside!S. Ensign, Atomic structure & nomenclature14How small is an atom???Density of a nucleus?Nucleus (proton(s) and neutron(s)p+p+np+nelectron: “orbits” the nucleuspnp+nS. Ensign, Atomic structure & nomenclature15Like forces repel, opposites attract, so… What holds the nucleus together? Why don’t the electrons fall into the nucleus??nucleus?? Nucleus (proton(s) and neutron(s)p+nnelectron: “orbits” the nucleusS. Ensign, Atomic structure & nomenclature16p+np+p+n
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