Which nuclear force hold the nucleus together against the mutual repulsion of the protons in every nucleus larger than Hydrogen’s?

Theoretically, which metal should be the most reactive? hydrogen lithium francium fluorine

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5