Why would it be hard to find the idea light intensity if the tempeture were very hot or cold

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?