Refer to your periodic table: Which of the following has the smallest atomic radius?

Bromine

Astatine

Iodine

Fluorine

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

How many neutrons does a atom of cobalt have?

Match the mixture with the substance// i really need on this guys (it’s a pic btw)