Hi, I understand for metals the conduction band is usually partially filled. However, at absolute zero, is the conduction band empty (for metals)? I'm asking this because as far as I know, the definition of valence band is "the highest occupied band at absolute zero" However, I have encountered a question that basically states that the conduction band of a metal is partially filled at absolute zero. This contradicts with the definition because that band would be the valence band, not the conduction band, according to the definition (and no, there is no overlapping of the valence and conduction bands of the metal in the question). Could someone also please confirm the definition of a valence band and conduction band? Thanks in advance.