1. the first ionization energy of Ca is greater than the first
ionization energy of K, but the second ionization of Canis lower
than the second ionization energy of K. Explain.
2. Compare the hybridization of the sulfur atom in the molecules
SF_2, SF_4, and SF_6
3. Assign formal charges to each atom in NH_4^+, SO_3^-2, and
XeF_2