Question

1. a) (1 mark) Arrange these elements in order of increasing atomic radius, from smallest to largest: Sb, S, Pb, Se Smallest smallest b) (1 mark) Arrange this isoelectronic series in order of increasing radius, from smallest to largest: Se?, Sr2*, Rb, Br Smallest Largest c) (1 mark) Arrange these elements in order of increasing first ionization energy, from smallest to largest: CI, S, Ge, Pb smallest < < < Largest NAME AND STUDENT NUMBER: 2. (4 marks) A molecule with molecular formula CH2Nz has a C-N-N bond angle of 180° and an H-C-H bond angle of 120" Draw the Lewis structure of this compound that is consistent with these bond angles and also satisfies the octet rule. Show all lone pairs in this structure using the proper dots (**) and determine the formal charges on all atoms. Indicate the formal charges on atoms only if they are not zero. If more than one resonance structure is possible, draw only the most important one. Also, for both of the nitrogen atoms in the structure, which orbitals on each atom are used to form the sigma bond to the other nitrogen atom? (you do not need to draw the orbital itself.

Answer 1