List four reasons why scientists perform experiments. Edit: this is for scientific research not chemistry, but they don't have that as a subject on here.

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources?