The diagram shows a chemical reaction that occurs between hydrogen and oxygen. Which scientific law is best demonstrated by the reaction shown in the diagram

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

The answer for this is a