In the neutral Al atom, what are the effective nuclear charges for a 1s electron and a valence electron, respectively? a. +12; +3
b. +10; +13
c. +12; +12
d. +13; +3
e. +3; +3

Which uses electromagnetic radiation to discover the properties and composition of bodies in space? space probe space station space shuttle space observatory

Sulfuric acid (a component of acid rain) reacts with limestone (calcium carbonate) to produce calcium sulfate and carbon dioxide. this damages buildings and statues made of limestone. which solution of sulfuric acid will damage these structures more quickly? a. 0.001% b. 0.005% c. 0.010% d. 0.015%

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