What bone that articulates with the clavicle medially?

The manubrium articulates with the clavicle medially.

Explanation:

The manubrium is seen as a flat bone at the superior portion of the sternum. It joins the clavicle medially, creating the sternoclavicular joint, by attaching to the clavicular notch. It is the strongest and thickest part of the sternum, which also resembles a handle of a sword (from Latin, manus, meaning handle). Inferior to the sternoclavicular joint, attachments for the first and second rib are present. The manubrium is also attached to the sternum via the sternomanubrial joint.

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a physical change is being made.