What you see as a pencil line is graphite - carbon. The graphite is held together by a clay which will contain very many elements specific to the clay being used.
Lead has been commonly used for thousands of years because it is widespread, easy to extract and easy to work with. It is highly malleable and ductile as well as easy to smelt. Metallic lead beads...
Well there is Carbon, Hydrogen, and Oxygen which makes up the plastic outside of a pencil sharpener. To know what element can be found inside you would have to know what a pencil sharpener is made up...