Which of the following is a characteristic of science? A It asks questions about the natural world.
B It asks questions that cannot be tested.
C It is done by only one scientist at a time.
D It uses opinions to make conclusions.

Idon't see the pic?

Ions gain or lose electrons

☆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