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?
o directly up
o directly down
o directly to the left
o directly to the right

Explanation:

In the periodic table, elements in the same group are arranged vertically. Atomic mass generally increases as we move down a group (due to adding electron shells and more protons/neutrons). So, to find an element in the same group with a smaller atomic mass, we look directly up (since moving up a group decreases atomic mass as we go to a period with fewer electron shells and lower atomic mass on average). Elements to the left/right are in the same period (horizontal row), not the same group, so those options are incorrect.

Answer:

A. directly up