Please Answer all 4 questions and i will give brainliest!

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

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.