Generic Query Atoms

    Name Description
    A Any (any atom except hydrogen).
    AH Any atom, including hydrogen.
    Q Hetero (any atom except hydrogen and carbon).
    QH Heteroatom or hydrogen (any atom except carbon).
    M Metal (contains alkali metals, alkaline earth metals, transition metals, actinides, lanthanides, poor(basic) metals, Ge, Sb, and Po).
    MH Metal or hydrogen.
    X Halogen (F, Cl, Br, or I).
    XH Halogen or hydrogen.