The biggest source of vitamin D is the sun.
Magnesium nitride weighs 100.95 g/mol
133/100.95 = 1.32 mols
Schrödinger found the quantum mechanical model of the atom after Bohr’s model.
It is better than Bohr’s model because you can use mathematical equations to find electrons certain position. Unlike Bohr’s which is just a “cloud” where the an electron could possibly be.
