How many covalent bonds are there in one molecule of silica, sio2?

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

Helium decays to form lithium. which equation correctly describes this decay?

What is the equation fort the alkaline zinc/manganese dioxide cell. a) anode b)cathode c)overall equations.