An argon ion laser emits light at 488 nm. What is the frequency of this radiation? (Inm=1x10^-9m) *

One does not belong why? ice, gold ,wood ,diamond and table salt

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?

Which compound contain an iron with a 3+ charge