A student is looking for an element to react with lithium to create the most vigorous reaction possible. To which direction on the periodic table should the student look?

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

let that person have a turn to speak : )

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants