There are 6 electrons in a triple bond; 2 sigma electrons and 4 pi electrons. Because the pi bond has less electron density between the atoms, it is of higher energy in the MO diagram and is weaker than the sigma bond. Pi bonds contain two electrons each. This way of bonding is known as covalent bonding and this is shown mainly by non-metals and H +. Put it simply, single bonds are sigma bonds, and double / triple bonds are Pi bonds. A triple bond involves the sharing of six electrons, with a sigma bond and two [latex]\pi[/latex] bonds. The entire molecule is planar. A triple bond contains one sigma bond and 2 pi bonds. And CBN, the first bond being a sigma bond, and the second / third bond being pi bonds. Sigma bonds are the FIRST bonds to be made between two atoms. Pi bond can't exist independently of a sigma bond. A chemical (covalent) bond is always made of one sigma bond. Ethene (C 2 H 4) contains a double covalent bond between the two carbon atoms and single bonds between the carbon atoms and the hydrogen atoms. Generally, double bonds consist of one sigma and one pi bond, whereas a typical triple bond is made up of two π bonds and one σ bond. They are made from hybridized orbitals. The second and third bonds are due to double overlapping of atomic p orbitals. Likewise, a triple bond consists of one sigma bond and two pi bonds. This is the sigma bond. 1sigma + 2pi There are 2 pi bonds. Pi Bonds are generally weaker than sigma bonds, owing to the significantly lower degree of overlapping. Note that every single bond consists of one sigma bond, and that the double bond is made of one sigma bond and one pi bond. They then can have extra pi bonds around the central sigma bond, forming double or triple bonds. It’s just that simple. In single bond, 2 electrons are shared, in double bond four electrons are shared and in triple bond six electrons are shared. These are the two pi bonds in a triple bond. The first bond in a triple bond is due to end-to-end overlapping of atomic orbitals. When a sigma and 2 pi bonds exist, a triple bond is formed. Here’s a video on counting sigma and pi bonds. In acetylene the ##CC## triple bond consists of a sigma bond and two pi bonds. Sigma and Pi Bonds. The hybridization model helps explain molecules with double or triple bonds (see Figure 1 below). The figure below illustrates the sigma and pi bonds in an ethylene molecule (C 2 H 4 C_2H_4 C 2 H 4 ). Overall this sigma-pi picture of the double bond is reminiscent of a hot dog in a bun. The pi bonds are formed by the side-on overlap of ##2p## orbitals. A double bond will have a sigma and a pi bond: 1sigma + 1pi A triple bond would have 1sigma + 2pi A quadruple bond would have 1sigma + 3pi, and so on. The sigma bond (σ bond) corresponds to the frankfurter, while the pi bond corresponds to the bun on either side of it. 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