How many grams of chromium metal are plated out when a constant current of 8. 00 A is passed through an aqueous solution containing Cr3 ions for 320. Minutes?.

They can measure  the amount of energy gained or lost

☆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