Which substance has the greatest atomic mass?

Question

A.) Aluminum Clippings
B.) Copper Wire
C.) Salt
D.) Iron Nails

Answer 1

Of the materials listed, Iron Nails has the highest. Iron has a higher atomic number than aluminum, copper, sodium or chlorine (the last two are constituents of salt). (atomic mass and number are related measurements of the mass of an atom. Iron has the most protons (atomic number) and thus the highest atomic mass of those materials (protons + neutrons in the nucleus)... a periodic table is a good reference for this...

Answer 2

I would say copper wire, but salt is not a good defintion of a substance, since you can imagine a salt which could have a high atomic mass. For NaCl common salt my answer seems correct