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

Questions 3 and 4

Answer 1

= a Fon iso electronic species, the ions having a higher positive ch- arge have the smaller radius than the neutral atom and the ions having higher negative charge have the groeater radius. Here all the species i.e.t, kt Ar, ca ²t all are isoelectronic having equal no. of electrons of 18 . The increasing order of roadius would be - C2+ {kt { As Let b On going froom left to right in a period, radius of atom de creas es again on going from top to bottom the atomic readi us increas es. & Now here the given atoms As. Bro, P, Al are situated in be

rojo dic table a riodic table as below - B N E Al P a Ga As Bool In sb Te Bi At So, (radius=ro) i Br < again top kra and roar and Pop < Bro Thus the in reasing order of radi us would be РК Вm A1 X A, Now , IN o P 5 a As se [Br] Sb Te I Bi Po At so y BF N By RN IN > NE

So, the increasing onder would be - IF LN LS LBro d. Electroong affinity increases from left to right and de creases from top to bottom. C NF So, the incre. [si] e [d] asing onder Ge As Bro Sn Sb l owould be - e Pb Bi At Si LCCNLU Ionization en have same trend as eleason affinity.

Li Be Na Mg K Ca Rb Sr B Al Ga In So the increasing oroder would be Rb L. Ca King LAI
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