I think you add 29.57 + 80 and the answer would be 30.37
It is b, i learned this last year hope this helps
Stoichiometry is the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers. Hoped this helped!!!!. Also if you are trying to look for the formulas it should be online just type in stoichometry formulas.
Answer:
Name the element: Beryllium
Number of shells: 4
Valence electrons: 2
Explanation:
