All gases are grouped together. Gases easily form compounds with other elements. Elements within a group have similar properties. Elements within a period have the same number of electrons.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which statement best describes the organization of the Periodic Table of the Elements?
Possibilities:
- All gases are grouped together.
- Gases easily form compounds with other elements.
- Elements within a group have similar properties.
- Elements within a period have the same number of electrons.

Elements within a group have similar properties.