Based on your description, the atom has 6 protons (red), which means it is carbon, as carbon's atomic number is 6. The atom also has 6 neutrons (grey), indicating that it is the isotope carbon-12 (the most common isotope of carbon, which has 6 protons and 6 neutrons). Finally, there are 6 electrons (blue) in the atom, which is typical for a neutral carbon atom.
So, the atom you are describing is carbon (specifically, carbon-12).