Which Element Mass Number Is 40?
Which Element Mass Number Is 40? Argon [Ar] has mass number (A) = 40. What element has mass of 40? Atomic Mass Name chemical element number 87.62 Strontium 38 88.9059 Yttrium 39 91.224Zirconium 40 92.9064 Niobium 41 What atomic number is 40? Zirconium is a chemical element with the symbol Zr and atomic number 40.