Delta bonds are bonds which contain two nodal planes, whose intersection is a line containing the segment joining the two bonded species. Delta bonds are so named because their orbital symmetry is the same as d-orbitals (except for 2z^2-x^2-y^2, which is sigma-like, and xy, xz which are pi-like) when looking down the bond axis. The d-block of the periodic table of elements consists of those periodic table groups that contain elements in which, in the atomic ground state, the highest-energy electron is in a d-orbital. ...

In chemistry, in sufficiently-large atoms, filled d-orbitals are low enough in energy to participate in bonding. The phenomenon is usually observed in organometallic species. A number of ruthenium and molybdenum compounds are quadruply-bonded, which can only be explained by invoking the delta bond. Chemistry (in Greek: χημεία) is the science of matter that deals with the composition, structure, and properties of substances and with the transformations that they undergo. ... Properties For alternative meanings see atom (disambiguation). ... The d-block of the periodic table of elements consists of those periodic table groups that contain elements in which, in the atomic ground state, the highest-energy electron is in a d-orbital. ... A chemical bond is the phenomenon of atoms being held together in molecules or crystals. ... Organometallic have classically been compounds having bonds between one or more metal atoms and one or more carbon atoms of an organyl group. ... General Name, Symbol, Number ruthenium, Ru, 44 Chemical series transition metals Group, Period, Block 8, 5, d Appearance silvery white metallic Atomic mass 101. ... General Name, Symbol, Number molybdenum, Mo, 42 Chemical series transition metals Group, Period, Block 6, 5, d Appearance gray metallic Atomic mass 95. ...

It is possible to excite electrons in acetylene from lower-energy nonbonding orbitals to form a delta bond between the two carbon triple bonds. This is because the orbital symmetry of the pi antibonding orbital is the same as that of the delta bond. Properties The electron is a subatomic particle. ... The chemical compound acetylene, also called ethyne, was discovered in 1836 by Edmund Davy, in England; its chemical formula is C2H2 and its structure is: Acetylene is a colorless and extremely flammable gas at standard temperature and pressure, with a melting point of -80. ... Electron atomic and molecular orbitals In quantum mechanics, the states of an atom, i. ...

Presumably higher-order bonds (phi and gamma bonds) are possible, with even more intersecting nodal planes, but these have not been observed.

See also

• Sigma bond
• Pi bond
• Molecular geometry