lect7prt - Rutherford's Proposal The Planetary Atom...

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Rutherford’s Proposal: The Planetary Atom Electrons in stable orbits Nucleus; holder of nearly all the mass, and all positive charge
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One of the fathers of the periodic table of the elements
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The elements look mistakenly weighed. And badly assigned. Periodicity requires assignments as shown. But masses are wrong! Mendeleev’s First Edition of the Periodic Table
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Julius Lothar Meyer 1830-1895 Li Na K Rb
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The modern periodic table Organized by Z—the number of protons in the nucleus—
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Unformatted text preview: rather than by A—the total mass of the nucleus Energy required to remove the first electron from the first 20 elements Moving electrons around is the key to chemistry! Energy released upon addition of an electron Elements are grouped with their families, not by mass But why do the families have similar properties? Why are masses such weird numbers? Metals Non-metals Metalloids, or semimetals Noble, or boring, gases...
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