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

To find an element with a smaller atomic mass in the same group, one has to look directly up in the same group.

Option a

Explanation:

In the "modern periodic table", when you move down in the same group, the atomic number of the atom increases. The definition of relative atomic masses states that it is the weighted average of the isotopic masses, where the number of protons and the number of neutrons sums up to give the isotopic mass.

While going down the group, we are adding up the protons. And, hence increasing the "number of protons" eventually increases the "atomic mass of an atom". Therefore, to find the light-weighted element in the same group, one should look directly up.  

directly up

Explanation:

trust me

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."