Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to find electrons [title] Obtain a periodic table of elements. [step] This is a color-coded table that organizes all the known elements by atomic structure. Each element has a 1 , 2, or 3-letter abbreviation and is listed along with its atomic weight and atomic number.

Ending1: [substeps] Periodic tables can easily be found in chemistry books and online. [title] Find the element in question on the periodic table. Ending2: You can obtain this table by purchasing an periodic table from a department store or buying it online. [title] Enter the atom and element number into a set of figures. Ending3: This list must match or exceed 1 , 024 atoms. [substeps] Finding the ratio of atomic weight to atomic mass can be tricky, especially if there are not any known atomic weight units. Ending4: [title] Multiply the atomic weight by multiplication. [step] You need to multiply it by the atomic mass in that atom to find electrons.

Answer format: ending1/ending2/ending3/ending4