Whether it is a fossil fuel or a biofuel, the fuel you put into your car must be burned to release energy that can power the car. This reaction is called combustion, and the engine in your car is an example of an internal combustion engine.

Let's examine a simple combustion reaction so that you can see how energy is released. In the reaction below, methane (the fuel) is burned with oxygen to produce carbon dioxide and water.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

the answer is b & c i believe : )

i think slash and

you need to have a picture of the atom that way we can answer it