Isotope one hyphenated name is Br-81. What is the hyphenated name of the
unknown isotope?

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp