To determine the element with an average atomic mass nearest to 31, we can refer to the periodic table or a table of atomic masses. the element with an average atomic mass closest to 31 is phosphorus (P).
The relative atomic mass of phosphorus is approximately 30.97 atomic mass units (u). It is important to note that the atomic masses on the periodic table are average values that take into account the natural abundance of different isotopes of an element.
Please keep in mind that this information is accurate as of 2023, and there may have been updates or refinements to atomic mass values since then.