Question

Explain how the atomic energy levels split into bands when a number of atoms are brought close together to form a crystal​

Answer 1

Answer:

Due to the Pauli Exclusion Principle each atomic orbital splits into N molecular orbitals each with a different energy, where N is the number of atoms in the crystal. Since N is such a large number, adjacent orbitals are extremely close together in energy so the orbitals can be considered a continuous energy band