Which of these is an example of investigating an intensive property?

500bc indiais the answer.

7is b8 is d9 is c10 is a11 is d

☆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