Which of the following correctly shows the formula unit formed when calcium (ca) and chlorine (ci) bond?

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

What is the maximum number of electrons that an atomic orbital can contain?

Which position represents spring in the southern hemisphere? a) b) c) d)