Why do all the elements in Group 16 share similar properties? A. They all have the same number of protons.
B. They all have electrons the same distances from their nuclei.
C. They all are in the same period of the periodic table.
D. They all have the same number of valence electrons.​

c

Explanation:

c

Now, you know that the sample of sodium metal reacted completely, which implies that it was completely consumed by the reaction.
In other words, you don't have to worry about the sample of chlorine gas because the fact that sample of sodium metal was completely consumed lets you know that the chlorine gas is not a limiting reagent.
This means that the reaction consumed