Look at the following electron configurations. Which of the atoms will have similar chemical properties? 1. 1s 2322p4 2. 1s22:22p3 3. 1s 25 2p°3s 3p^4s?310 4p4 2 and 3 1 and 2 1 and 3 all of them
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- The 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-1 ΔHL (KCl) = 719 kJmol-1The 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-117 16 15 14 13 12 11 D Nombre de protons Nombre de neutrons Carbon: C 6 Hydrogen: H 1 Oxygen: O 8 8 1- Distinguish between an element and a compound. 2- Deduce that ethanol is a compound substance. 3- Determine the number of electrons of an atom of element O. 4- Identify the atoms D, B and E. 3- Choose from the following formulas the ones that represent the ethanol molecule: on DBE, D,B,E D,BE, 81 Mass Number
- Despite the expected decrease in atomic size, there is an un-expected drop in the first ionization energy between Groups2A(2) and 3A(13) in Periods 2 through 4. Explain this pattern interms of electron configurations and orbital energies.Given: 2H+(aq) + 2e– → H2(g); 0.00 VRb+(aq) + e– → Rb(s); –2.98 VF2(g) + 2e– → 2F–(aq); 2.87 VAl3+(aq) + 3e– → Al(s); –1.66 VPb2+(aq) + 2e– → Pb(s); –0.13 V Under standard-state conditions, which are the strongest reducing and oxidizing agents? Group of answer choices H+ and F2 Rb and Pb2+ Al3+ and F2 Rb and F2 Rb and F–(a) Account for formation of the following series of oxidesin terms of the electron configurations of the elementsand the discussion of ionic K2O, CaO, Sc2O3, TiO2, V2O5, CrO3. (b) Name these oxides.(c) Consider the metal oxides whose enthalpies of formation(in kJ mol -1) are listed here. Calculate the enthalpy changes in the following general reactionfor each case:MnOm(s) + H2(g)----->nM(s) + mH2O(g)(You will need to write the balanced equation for each caseand then compute ΔH°.) (d) Based on the data given, estimatea value of ΔHf° for Sc2O3(s).
- The reaction of lithium with sulfur is similar to that of sodium with sulfur. Write the balanced chemical equation for the reaction of lithium with sulfur. Include phase symbols.At large interatomic separations, an alkali halide moleculeMX has a lower energy as two neutral atoms, M + X; atshort separations, the ionic form (M+)(X-) has a lowerenergy. At a certain distance, Rc, the energies of the twoforms become equal, and it is near this distance that theelectron will jump from the metal to the halogen atom during a collision. Because the forces between neutral atomsare weak at large distances, a reasonably good approximation can be made by ignoring any variation in potentialV(R) for the neutral atoms between Rc and R - `. For theions in this distance range, V(R) is dominated by theirCoulomb attraction.(a) Express Rc for the first ionization energy of the metalM and the electron affinity of the halogen X.(b) Calculate Rc for LiF, KBr, and NaCl using data fromAppendix F.Assume that you have these materials:a) Li (s); b) Br2 (l); Ge (s) and d) Si(s).Choose the best electrical conductor among them and explain why.
- The ionization enthalpies of group 15 elements are higher than those ofcorresponding members of group 14 and 16 elements. Assign the reason.The electron configuration of an element describes how electrons are distributed in its atomic orbitals. (a) Explain the applications of the Aufbau principle, Hund's rule and the Pauli exclusion principle in relation to electronic configuration of oxygen atom. Explain how these principles determine the stability and reactivity of atoms oxygen.(a) What is the trend in first ionization energies as one proceedsdown the group 7A elements? Explain how this trendrelates to the variation in atomic radii. (b) What is the trendin first ionization energies as one moves across the fourthperiod from K to Kr? How does this trend compare with thetrend in atomic radii?