Please do this 50 points link in questions

then save the work you did and put in as answer

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

What does the process of natural selection involve

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?