How many electrons does it take to fill the outer energy level of most atoms

Ineed with a, b, c, d, and e on the long answer

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !