Indicate the direction of polarity of each of the covalent bonds by placing the appropriate delta notation next to each end of the bond please just write a + or - not the bonds. A. C-OB. O-ClC. O-FD. C-NE. Cl-CF. S-HG. S-Cl

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

13) a 14) a15) b16) i don't know sorry17) a (maybe)