The element boron (b, atomic number 5 and atomic mass 11) is right above aluminum (al, atomic number 13 and atomic mass 27) in the periodic table. how many more electrons does aluminum have than boron? why?

What is the major limitation to the light microscope?

Why does lightning travel from clouds to the ground?

A200-n force is applied to the foot-operated air pump. the return spring s exerts a 2.6-n·m moment on member oba for this position. determine the corresponding compression force c in the cylinder bd. if the diameter of the piston in the cylinder is 40 mm, estimate the air pressure generated for these conditions. state any assumptions. enter a positive number for the compression force c.