The prefix 'di' means two. Hence two atoms make up a diatomic molecule.
Hope this helps!
The amount if protons is the same as the amount of electrons, so it would be 8. The charge is -2. Look at oxygen in the periodic table.
I do not understand your question, what is the question, name what??
A: because the light is lower than the hole, it will come in at in inclined angle. if the hole was say at the same level as the hole, it would shine straight to the other side of the box
Personal experience from Ag Mech classes-Concrete cools faster than metal.