7. Which of the following has the greatest mass?
a. 2 mol H20.
b. 2 mol NH3
c. 2 mol CH4

Neither model is able to show the reactivity of potassium.

☆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

Are you going to give an example of the plant or?