All are paired bones except

The vomer is an unpaired facial bone in the human skull. It is a flat, thin bone that is located in the midline of the skull, dividing the nasal cavity into two separate chambers. The vomer articulates with several other bones, including the maxilla, palatine bones, sphenoid bone, and ethmoid bone.

Parietal bones are paired cranial bones.

Zygomatic (cheek) bones are paired facial bones.

Scapula are paired bones which are part of pectoral girdle.