Give an example cach for a chemical change where light, pressure, electricity is required.

i'm assuming that the correct answer is indeed the first one/ "a"..

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

distance, luminosity, brightness, radius, chemical composition, and temperature

increased stability in the completion of fluorine's outer shell.