in a triple beam balance how do you know when you have to move a weight back to the previous notches or grooves

Five students had to answer the question how are elements arranged in a periodic tabledamon: i think the elements are arranged by increasing massflo: i think the elements are arranged according to their properties sienna: i think the elements are arranged by when their discovers kyle: i think the elements are arranged according to how common they areglenda: i don't agree with any of themwho is right

Particles vibrate in a rigid structure and do not move relative to their neighbors.

How do you know when a chemical reaction has occurred