Steric number = SN = the number of bonds + the number of lone pairs NOTE: the number of bonds just counts each bond once, even if it is a double or triple bond. Don't worry about those yet... we'll get to that later! Now, the steric number (or SN) will tell us the geometry of the molecule.nce you have a completed structure, you are ready to continue! To determine the shape of a molecule, or its geometry, we use something called VSEPR Theory, which is short for Valence Shell Electron Pair Repulsion Theory.
1 The exposure compensation button can be used when your camera is in any non-automatic mode. 2  For example, you can use it while your top dial is on P (for program), S (Nikon shutter priority), TV (Canon shutter priority), A or AV (aperture priority) and M (fully manual) modes.
If you own a digital SLR, play with these ISO settings to see how it can improve your photography. Purposely leave your flash at home and turn the ISO settings right up to see how it functions. Heavy grain in some images such as buildings or landscapes can really add great, moody effects to your shots.