What happens when aluminum fills it's valence shell?
a. three electrons are gained, creating al^ 3
b. three electrons are lost, creating al^ 3
c. three electrons are lost, creating al^-3
d. three electrons are gained, creating al^-3

Which activity describes an application of topographic maps? check all that apply. recreation, such as camping and hiking engineering, such as the construction of roads and buildings science, such as mapping stars in the sky business, such as analyzing population centers science, such as analyzing surface features