Please help thank you so much

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"

Ansa leaf changing color in autumn;

Seems cool i guess ttyl

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.