20. Fill in the blanks: \begin{tabular}{|l|l|l|l|l|l|} \hline Element/Ion & AtomicNumber & NumberofProtons & Numberofneutrons & Numberofelectrons & MassNumber \\ \hline32S2 & & & & & \\ \hline47Ag+ & & & & & \\ \hline66Zn2+ & & & & & \\ \hline190Os30.3 & & & & & \\ \hline Cr3+ & & & & & \\ \hline P3. & & & & & \\ \hline \end{tabular}