A 5-column table with 2 rows. Column 1 is labeled number of protons, with entries A and D; column 2 is number of neutrons, with entries 7 and E; Column 3 is atomic number, with entries B and 26; Column 4 is Mass Number, with entries 15 and 56, and Column 5 is Element (symbol) with entries C and F. Using the periodic table, complete the table to describe each atom.