The spatial arrangement of electrons groups around the central atom is called?
A- geometric design
B- electron-group geometry
C- electronegativity
D- electron-pair repulsion

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass

Who was the first scientist to measure speed as distance over time?

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?