What is the electron dot structure of an alkyne?
Carbon needs four electrons to fill its octet.  In a $\ce{C-H}$ covalent bond carbon shares one electron with hydrogen.  A triple consists of one &sigma; covalent bond and two &pi; covalent bonds.  The carbons share two electrons in each of these bonds; in total six electrons are shared between them.  You can draw this as a dot structure:  

$$\ce{H:C:::C:H}$$