Why are antiparallel beta sheets more stable than parallel beta sheets?

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-

What does an electron configuration for an atom relate to the atoms placement on the periodic table

A2-kg bowling ball is 1 meter off the ground on a post when it falls. just before it reaches the ground,its traveling 4.4 m/s. assuming that there is no air resistant, which statement is true a. the initial potential energy is less then the final kinetic energy b. the mechanical energy is not conserved c. the mechanical energy is conserved d. the initial potential energy is greater than the final kinetic energy