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Molecular Structure (Cont.) VSEPR Intro. Readings for this section. Petrucci: Section 10-7. NOTE All the coloured pictures have java-enabled rotatable models available. Click on the image to open the page containing the java applet. Make sure you have the latest version of Java installed and that it is enabled on your browser. VSEPR Theory (Molecular Shapes) A = the central atom, X = an atom bonded to A, E = a lone pair on A Note: There are lone pairs on X or other atoms, but we don't care. We are interested in only the electron densities or domains around atom A. Total Domains Generic Formula Picture Bonded Atoms Lone Pairs Molecular Shape Electron Geometry The shape of the orbitals is trigonal bipyramidal. Two of the equatorial orbitals contain lone pairs of electrons. Two of the equatorial orbitals contain lone pairs of electrons. The three atoms are arranged around the central atom to form a T-shaped molecule .