With Sp3d hybridization, a seesaw or linear shape is possible. The seesaw shape occurs when the molecule has the form AB4E, where A is the central atom, B represents the atoms attached to the central atom and E is a nonbonding pair of electrons attached to the central atom. Linear is in the form AB2E3. So A is the central atom and should be by itself and the only choice that fits that criteria is answer A (BrFs) Solution With Sp3d hybridization, a seesaw or linear shape is possible. The seesaw shape occurs when the molecule has the form AB4E, where A is the central atom, B represents the atoms attached to the central atom and E is a nonbonding pair of electrons attached to the central atom. Linear is in the form AB2E3. So A is the central atom and should be by itself and the only choice that fits that criteria is answer A (BrFs).