Question

3. (20 marks) Arrange the following elements in the order of: a) Increasing radius: Cl', K*, Ar, Ca2*; b) Increasing radius: As, Br, P, Al; c) Increasing radius: N, S, F, Br; d) Increasing electron affinity: Si, P, Cl, C; e) Increasing ionization energy: Al, Rb, Mg, Ca, Mg 4. (20 marks) The following three Lewis structures can be drawn for N2O: N N-O :N-N=O:-:N=N=ö: a) Show the correct formal charges on each atom. Considering these values, which resonance structure is likely to be the most important? Explain b) The N-N bond length in N2O is 1.12 Å, slightly longer than a typical N N bond; and the N-O bond length is 1.19 Å, slightly shorter than a typical N-O bond. Bases on these data, which resonance structure best represents N2O? Explain. 5. (30 marks) Using the Valence Shell Electron Pair Repulsion theory, predict the geometric arrangement of each of the following molecules around the central atom (the underlined atom). In each case give a clear three-dimensional picture to show the geometric arrangement of substituents and lone pair electrons about the central atom and also write the Lewis structure; the AXE classification; b) the electronic structure; c) the molecular shape; d) е) the angle between the bonds; f) the polarity (polar or non-polar). РО,3. CIO3 OF2 KrCl2 ICls SeO2

Question 4

Answer 1

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two bond only muke oxygen in Nihojen muke only suena u Lshort method nemod 9 oxigen DATETIT | 460ml Comore] UL:NON-0: S1 bond less 3bond (2) N – N30: N = N = 5: (3 Structure is most important or may be 2) and less formal for Charge - more stable fore By we know in Structure I also have some formal charge more But in Structure 1 -ve chang in oxygen which make o important I we know that N = NL NEN LN-N NEO L N = 0 CN-o according to data a N -O N = 0 it means between N to o we have Ν Ξo - N- N N N it means Between two Nitrogen we have may be double or Lingle bond. Ans 2 N-N=0 is Best PAGE