Washington, D.C., formally the District of Columbia and commonly referred to as Washington, the District, or simply D.C., is the capital of the United States. The signing of the Residence Act on July 16, 1790, approved the creation of a capital district located along the Potomac River on the country's East Coast.
Now three of these sp 3 hybrid orbitals form sigma bonds by overlapping with three 1s orbitals of the three hydrogens and the remaining sp 3 hybrid orbital forms a sigma bond by overlapping with the sp 3 hybrid orbital of the other carbon which also has three Hydrogens bonded to it in the similar manner.
In a covalent bond, the orbitals (areas where the electrons inhabit) overlap and create a new space where the electrons can only be found. The amount of orbitals overlapping determines the type of bond (single, double, triple, or even quadruple). In an ionic bond the electron isn't actually donated and removed from the atom itself, it's just so unequally shared between the two atoms (now ions) that it is considered donated to the other atom.