The carbon-nitrogen bond in formamide, HCONH2, has been shown to have a bond length that is in between a typical C-N single bond and a C=N double bond. Provide an explanation for this observation, using relevant chemical structures to support your explanation.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

i believe the answer is a.

i belive it is water