0.25 mole of o2 will contain the same number of molecules as 0.25 mole of nh3.
true or false ? ?

True, because most molecules have the same chemical or germ. Like 2.5 of an OxN = the same amount .

☆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