Astudent calculated the standard enthalpy change of formation of ethane c2h6 using a method based on standard enthalpy change of combustion

The gas would begin to expand, and eventually the can would burst or explode.

☆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