oh no it seems that a few points fell out of my pocket because I have too many, hopefully, no one takes them while I'm not looking.

it should be all of them because it asks if you included all of those in your answer

explanation:

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.

since electrons are negative the answer is neagtaive