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.
In photography, the exposure settings of aperture, shutter speed and ISO speed are analogous to the width, time and quantity discussed above. Furthermore, just as the rate of rainfall was beyond your control above, so too is natural light for a photographer.