Hydrogen azide, HN₃, can exist in two forms. One form has the three nitrogen atoms connected in a line; and the nitrogen atoms form a triangle in the other. Construct Lewis structures for these isomers and describe their shapes. Other interesting derivatives are nitrosyl azide (N₄O) and trifluoromethyl azide (CF₃N₃). Describe the shapes of these molecules based on a line of nitrogen atoms.