the energy required to remove the third electron from an Al atom is smaller than that required to remove the t?
removing the third electron from aluminum would remove the 3p1 electronThe aluminum would then have an empty shell, something it would like and requires little energy to obtain compared to removing the third electron of magnesium, which would be the 2p6 electron, and would thus break the octet, something that requires a tremendous amount of energy to do.
I would put it in the fridge with something over it that won't touch the cake itselfThis keeps in the moistureI usually use a large plastic bowl or dish upside down or if you don't have a container big enough make a plastic wrap tent by lightly putting a few toothpicks in the cake and keeping the wrap off of the actual cakeJust put the picks in places that no one will notice if you are that worried about frosting presentationHope that helps :)
Do you have any large bowls you can place upside down over the plate?
The type of cake and type of icing would determine the answer.