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.
1 The exposure is controlled by the camera's light meter. 2  The light meter determines what the proper exposure is; it all sets the f-stop and shutter speed. 3  The f-stop is a fraction; the f represents the focal length. 4  The f-stop is determined by dividing the focal length by the aperture.