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Physical Chemistry
- What is the electron configuration of Al 3* ? O (Ne) 4s2 3p! O (Nc|4s? O (Ar) O (Nc] O (Nc) 25? 3p!arrow_forwardThe standard formation enthalpy of KCl is -571 kJmol-1. Plot the Born-Haber cycle and calculate the electron affinity of chlorine with the help of the data below. ΔH°a(K) = 89 kJmol-1 BE(Cl-Cl) = 244 kJmol-1 IE(K) = 425 kJmol-1ΔHL(KCl) = 719 kJmol-1arrow_forwardPlease send me the question in 20 minutes it's very urgent plz findarrow_forward
- i need the answer quicklyarrow_forwardCalculate the fraction of atom sites that are vacant for lead (Pb, Z = 82) at its melting temperature (327 degrees C). Assume that the energy for vacancy formation is 0.55 eV/atom. Calculate the fraction of vacant sites at room temperature (25 degrees C). What is the ratio of these two values?arrow_forwardPlease answer thisarrow_forward
- Photoelectron spectroscopy studies of silicon atoms excited by X-rays with wavelength 9.890 × 10-1º m show four peaks in which the electrons have speeds 2.097 × 107 m s-!, 2.093 x 107 m s-!, 2.014 × 107 m s', and 1.971 x 107 m s-1. (Recall that 1 J = 1 kg m² s-2.) (a) Calculate the ionization energy of the electrons in each peak. (b) Assign each peak to an orbital of the silicon atom.arrow_forwardin ne taist ME He Pa Example 4. Why do the transition elements exhibit higher enthalpies of atomisation? ( DA Try percet HOarrow_forwardThe photoelectron spectra of elements X and Y are shown below. What is the most likely chemical formula of the compound made from these elements? X 42.7 2.90 390 34.0 4.65 0,59 100 10 1 lonization Energy (MJ/mol) Y 67.2 1.68 3.88 100 10 lonization Energy (MJ/mol) O XY2 O XY ) X3Y2 O XY3 Number of Electrons Number of Electronsarrow_forward
- Carbon has electronic configuration 1s2 2s2 2p2 . How will you justify its tetravalency?arrow_forwardThe quantum numbers for the electron(s) in the valence shell of thallium (81TI) are: NOTE: the designation electron(s) with brackets around the s means that there might be only one: "electron" or there might be more than one: "electrons" O (6,1,-1,2) (6,1,0,½) (6,1,1,½) O (6,1,-1,12) O (6,0,0,±12) (6,1,-1,½) O (6,0,0,±½/2)arrow_forwardGroup the electronic configurations of neutral elements in sets according to those you would expect to show similar chemical properties. Note that as long as the configurations are grouped correctly with regard to each other, it does not matter each group. Set A Set B Answer Bank 1s 1s 2 2p² 1s 25 2p 3s23p 6p² 1s 2s 2p 3s 3p®4s² 1. 22 1s 25 2p 3s²3p 25 A stvarrow_forward
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