Question

while looking at xenon (xe) on the periodic table, a student needs to find an element with a smaller atomic mass in the same group. where should the student look?
directly up
directly down
directly to the left
directly to the right

Explanation:

In the periodic table, atomic mass increases as you move down a group. So to find an element with a smaller atomic mass in the same group as xenon, one should look directly up.

Answer:

A. directly up