Which of the following is best revealed by the bohr model? . a. electrons are found only within the nucleus of an atom. b. protons orbit the nucleus of an atom in fixed proton shells. c. neutrons orbit the nucleus of an atom in fixed neutron shells. d. electrons orbit the nucleus of an atom in fixed electron shells.

Evaluate this exponential expression,8. (2 + 3)2 – 42

What is the molar mass of potassium nitrate, kno3

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 !