The fractions have a value of because the numerator and denominator are equivalent to
each other. So, when we use them, we are not changing the measurement only the way we represent the
measurement.

Ibelieve its because the stove is a cleaner burning fuel

Well you can immediately rule out a and d because if a metal were to lose or gain protons, then it would become a different element all together. the answer here is b because the positive symbol with a number refers to how many electrons the metal can give away to become stable.