ss_1 - 2. The density of tungsten (W) wire is 19.3 g/cm3....

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Unformatted text preview: 2. The density of tungsten (W) wire is 19.3 g/cm3. Its atomic weight is 183.85 g/mole. Estimate how many W atoms are contained in a piece of tungsten wire which has a diameter of 1 mm and a length of 1 cm such as might be found in the filament of an incandescent light bulb. UOmMiz C98— wflvc : \) “:— KYSEL 3' EYXO,0€Ch\-LL\CM\ = Gnome“ a} t: WM%1 @mmg Wag figgkfigfb8w$wfl 7:. MFR M070 Mmg fisfiz WQVQK new mm mxzuewre mic Tim M" N gpfig bum 00C NMZV- 12. (a) The atomic number of the element sodium (Na) is 11. Write the electron configuration using the spdf notation. (b) Based on its electron configuration, briefly explain why Na has a low electronegativity (0.9). (c) sketch a planetary model of a sodium atom labeling each electron orbital with its spdf designation. \ 7: ‘r— \\ \(3. 2r: 2.? $3 gobwsx web a meor we flax/womuay 'KQW {7 VWQX WM @359: km W“ can: out. K7 waxer as memo“) u {>362 Lat/PC hot“ fix f-«ULQB (\=Z 6%XELL- GM.) “‘35 M \Y °P\\LS W: 1.5 canon W {9:51 Q33: vaW W ////;:-§\ ' w\\ f 15. a. Create an energy level diagram for chromium (Cr). b. Does a photon with wavelength 0.161 nm have enough energy to eject a K electron from chromium? c. Can a chromium core electron have an energy between the K and L1 energies? Briefly justify your answer. snow b 53% €338 -—--I Table: Electron energy levels (eV) for selected elements Element K L1 L2 M23 M45 Cf 5989 695 584 74.1 42.5 2.3 Cu 8979 1096 951 120 73.6 1.6 NO 20000 2855 2625 2520 505 400 229 W 69525 12100 11544 10207 2820 ® 912.0 ® "7'3 E: 11w = 9A1 -U\'2-'S r--* :5 M “N — e gnu: \ .. x __—-- - *1 -ms 46 6% b 3 M tan-nde _. -Ol _.Z \r 5%“ 0.\L7\ 1H0 M fi“ _ = D 3V N “v; Coiljllégfik mfifs ‘11.? L ,6glficx ew‘ ml“ ‘3’ ‘S‘fifiqh “\3 To 1X ‘aWkk (9 N $gw§2§> QUEC‘LTWM We“ Cl. Q)": Z.’ 13%. \QWWS we N; K. Mex. ED 96'? web—11w em a ,1.» ram we. we tam-7 firm-egg . Wrote l‘r\ Cr Care tcwcfiwm any M152 W R9 WEZZJY. ® Wei? x: NJ 6% comm-Aw \kIW5L-..4’k“fbr\.xt swam-J R‘zwo‘fiz “WWW: \g k Mmmma km N fifirx Cums; {\T' k ‘bwzctfififl \mmAm-«Lg GSAOMEI V1). Nos“? MTEAMS Rxbmpx; £43sz MARX Wu? NE: W Va (A m2 v65 no “ma 22. The potential energy of interaction between two copper atoms can be modeled as: 12 6 Up) = 43UHE) —(E) J where EU = 0.583 eV and 0‘ = 0.227 nm 1" r Determine the equilibrium separation, to, between two Cu atoms. NT gamuigbm (XDQA : _¥b\: D ‘\e W paw—Maxi: M &F Bamwa MS 47- fié Nae; mam OLA: WE\U‘Q r -— o- r 1 Meant/fob. _ A =3 My weRbIBU‘“ 93—- L-6\<>—"« 1 = ‘—\6 (so-’6 H \ijz -= O ‘1}- Vi} .__ e ‘9 \Q (i; h *5 6 = \357— “'5 h ‘11 _ (3' V\53 o 60 -_—. M226: (DJ/KW “Tens mxuwbbvh gmndr $W’Ukb 355: TRAP/32, we». {>700th Wakqu 0? ix WW Pawn NIL \Wkwfic 59. wmta \8 ‘~ :2. .2? MM)ka \D W! sookzm%, of,» O\ m AW @\LO.\1% n+~\-‘-‘- "1 O.2§€r\t~—\\ Nix-b 009. caxmemm Nam MAWS Cm» mesa 24. Sketch well-labeled energy-band diagrams illustrating the relative positions and filling characteristic of a semiconductor and an insulator and briefly indicate why the electrical conductivity of a semiconductor is higher than that of an insulator. m E: D :5... 1:) ————-~ W2 mm “*2: \ Em ‘Ef‘vfi f 4,2 mm? 6924/44/14“, w» 4 wamfi “Saucm on:th W532 sww%. W Fmth ot- Mum mam WVfiE—WQENBWEW‘wéfi- Whiz/9h u M as \s N m szw Ex, \Wmm-Q 25%“ 4. 3‘” ‘30 mes may \5 Womub ‘1 i '" Ch To?) QXc-m £3 Rug.pr M. I W “S TU “a g,“ F wmwmum. Coméhocfla‘t‘tki 0—. ~:26— - "\ x.» am 0-- (2.t5>\c9c$‘€fi3 WOWCKL ngwhou /, 5%;wa um)ij W EW‘O‘R’ICM Mk2. otm wwwzs Ur wxacfibuwzg Hi2. Nguumgu cm 15%. Coqu hm: Encrmwzh w/“baQMQ A W83 \t—Nouhfl': bore Pskm‘I\\~Z: on W WW2». kkS. ; + 4. Aluminum and silver have similar lattice parameters and crystal structures. From these, determine the density of each metal and explain why the two densities are so different despite the fact that the atomic sizes are so similar. QM: O.U\OSC> {\m FCC. Nor-- Zia/13 MmeQ was: Owiosé, M ‘FCC W: \fl-‘EW/vmie Bantam mews, we was; We. Lam-r- were, \\_> Pvtafium‘r be». WE wmgems Tom We 0‘9" L\ axons no N \JouHa 69$— A swab}; UPC? Wkk. \ “‘ 26% 6M: @V‘Q Léfié‘i’wg J :. 239.3:— CD. PKG-309,43”: %® (1 Chg Ame-s ‘bllmwfii’vk‘l ( A” ‘ . 8‘“; QB kabmisfié = \060 Car/w _. @Mflfiéfi >< [5 i we. ems \V w: Wk M m2)er MD“? 5 x link UQV “SW” NZ... Wt. bxW. M Mew \e. W5 bub; “YO Wfizk‘C/TM We: \9 k KpT mm: gum ._ mmmh‘ worms. 9‘ pfiufiam - \PE:\\>2¢ Wt, PC}; tam-“c, @m M \p N l\\ mhxl $\>9&B&, 6. The atomic weight of vanadium (V) is 50.94 g/mole. Its density is p=5.96 g/cm3. It has the BCC crystal structure. Calculate the atomic radius of vanadium. Qnfirm that this matches the . '1.» value given in Appendix A. = 2%‘H\o‘“ 3 600% Mpsmza Mb - oh 1 so Mats swam as: T—-‘> a“: EDSRw' cm 3;:“3 New: TD basan W“; T“ ' w W m V: ELO "505% = mm M emsmcz, vmous \D o? 0? Vol bxW Want. 8W3. ...
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ss_1 - 2. The density of tungsten (W) wire is 19.3 g/cm3....

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