Acarbon atom can form four covalent bonds. how many valence electrons does a carbon atom have

Could someone me find the answer to this problem.

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.