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.
You obtain the best image quality by using the lowest ISO possible on your digital camera. 1  If you want to ensure your digital camera always uses the lowest ISO setting, switch the ISO setting from the default Auto ISO (this setting is usually found in the Menu) to the lowest possible on the camera, say ISO 50.