Name 3 professional areas in the u. s. that use the metric system

Pharmacists, Nutritionists, and Doctors/Nurses. Will use the metric system

The answer is celsius 

☆ionisation energy increases across a period from na -> ar☆ionisation energy decreases down a group from li -> fr☆ionic radius decreases across a period from na -> cl☆ionic radius increases down a groupfrom f -> ii hope it clarifies your doubts