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Molecules in this category may have five, six or seven atoms.  The configuration is specified as AX₆ for the case with seven total atoms, AX₅E for the case with six atoms and AX₄E₂ for the case with five atoms.  Remember the "E" represents electron groups that are not involved in bonding, the "X" atoms around the central atom and the "A" is the central atom.  Molecules of the type AX₆ are octahedral, molecules of the type AX₅E  are square-pyramidal and molecules of the type AX₄E₂ are square-planar.