Hydrocarbons are compounds that are made up of only carbon and hydrogen atoms. Write the skeleton equation and balanced chemical equations, including all states of matter, for the complete
combustion of propane (C, Hg).

right

explanation:

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.