HELP ASAP THIS IS FOR USATEST PREP!! This is the distance from the center of the nucleus to the outermost electron of the most commonly formed ion for any element.

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

The reaction q+r2=r2q is found to be first order in r2 and

How many neutrons does a atom of cobalt have?