Lab: Ionic and Covalent Bonds
I need help on a Hypothesis or Prediction

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.

Which other elements contain the same number of outer electrons as sodium

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?