All of the elements in a family or group have similar chemical properties. which of the following statements best explains why this is true?
a. the elements in a group have the same number of protons in their nuclei.
b. the elements in a group have similar atomic mass numbers.
c. the elements in a group have the same number of valence electrons.
d. the elements in a group have similar atomic numbers.
i don't don't have my notes either.

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?