What title belongs in the circle labeled x in the diagram below?

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

Why does a cake rise when you bake it? ♡

Describe the forces both attractive and repulsive that occur as two atoms move closer together.