Compare and contrast the properties of charcoal and carbon dioxide

Carbon and Oxygen both are on the second period, therefore, they both have two energy shells. - Carbon's atomic number is 6, and Oxygen's atomic number is 8. So Carbon has 6 protons and electrons, and Oxygen has 8 protons and electrons. - Carbon's atomic mass (or mass number) is 12, and Oxygen's atomic mass is 16. - Carbon has 6 neutrons, and Oxygen has 8 neutrons. - Carbon can be black, while Oxygen is clear and odorless.