Many times, I find it hard to draw correct Lewis structure of molecules with nitrogen. For instance: the Lewis structure of H2CNN. I thought it should be double bond between C and N and single bond between N and N, like this:
But actually it's not. I have done many problems like this wrong...
[FONT="Verdana"]I learned on the textbook that human calculated the orbital of planets that near the Earth first then based on the difference of the actual data of the planet orbitaland that of human predicted, human calculated out other planets' orbital and predicted some planets like Neptune...