What part of the electromagnetic spectrum that is necessary for the sense of sight in humans?

Which statement describes james chadwick’s discovery.

According to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? view available hint(s) according to the valence shell electron pair repulsion (vsepr) theory, a molecule that has four electron groups around the central atom will exhibit what electron geometry? trigonal bipyramidal tetrahedral square planar determination of electron geometry requires information on whether the electron groups are lone pairs or bonding groups.

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.