012 - (c Elements defined by protons(7 Atomic number liH 2...

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Unformatted text preview: (c) Elements. defined by # protons (7 Atomic number) liH, 2 He, 3 Li. 6‘C‘7NU is Fe,“ 92o (9) Electron Structure: Energy inside Atoms (a) Electrons 1/4300 mass of‘pm negative Charge it‘#e=4 #p 9 neutral atoms il‘flte ,L lip —) charged w (usually Fewer e) \‘l depiction (b) Orbits A l Since 0‘ 6 attracts -) nucleus" 7 .m " 1 - CSDJ’IVEJ‘BUS & e 5 less masswe than nucleus J ; (analogous to earth orbiting sun) (9) Light «1» Atom interactions Photons interact quite strongly with electrons in atoms a) electronjumps down 9 photon emitted b) electron iumps 2g 9 photon absorbed .H : j ‘ Single polars emitted-”absorbed i ammo“ ‘ _ ‘ petttqnfw.” Lolot set depends on orbit set l Diflerent for each atom. l c) electrongected (ionization) 9 energetic photon absorbed W, ,,,,,,,,, ,,7, (d) Molecules several atoms bound together ‘ ‘ “Jim H.o rmmi r, _.OH Serotonin C‘DHHNTO (e) Isotopes same # protons but different # neutrons : (Atomic mass number = # protons + it neutrons) e g C12 span; C5 ‘ 6p7n ; CH ‘ 6p8n I isotopes at carbon 4 Recall all particles also behave like waves must have whole number othaves, L2,} waves -) Ms l l 3 . e's lit in nested shellst falling. innermost ones first I shells have different few innermost 9 lowest energy I 'l (C) Only specific orbits (and energies) are allowed ' L 7cm“ ; _ treegletisnn \- wi .m { , x “(it i ,7 7 (In ,l-rx- ' '\ W,- a m» 7w J i r _ lmll 7 n # 7 :m mm x, t- r \ \—I . itll \ I wait ‘ -‘ I r'. at 1' , m 7 ,7 777 mi [Litton .tni. i—tflblls Urbll energies Example: Hydrogen & its Spectrum Atomic orbits are often redrawn as energy level diagrams 1 Bohr orbit figure Energy lct'cl diagram Hydrogen spectra rite particulariy simple Several line series Lyman (UV); Baliner (optical); Pasehen(lR},, , . ...
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