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, elements in the same group (vertical column). As we move up a group, the atomic mass generally decreases. Moving down a group increases atomic mass. Moving left or right is within the same period (horizontal row) which is not relevant for same - group comparison.

Answer:

A. directly up