In chemistry, transition metals often have their valence electrons located in these orbitals.
In computer science, a type of flip-flop named for this letter is often contrasted with the T type. In earth science, this letter followed by double prime refers to the layer located above the core-mantle boundary. In astronomy, the innermost of the rings of Saturn is named after this letter. In chemistry, transition metals often have their valence electrons located in these orbitals. For 10 points, identify this letter that also names a vitamin that is essential for calcium metabolism, a deficiency of which can lead to rickets.
In computer science, a type of flip-flop named for this letter is often contrasted with the T type.
D