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.
There are three exposure parameters â aperture, time (shutter speed), and sensitivity (ISO), and in different modes these are each set automatically or manually; this gives 2 3 = 8 possible modes. For a given exposure, this is an underdetermined system, as there are three inputs but only one output.