Idon't understand what the answer choices mean can someone me out? which of these is an ionic compound? no2 licl so3 co

Rutherford's experiment indicated that matter was not as uniform as it appears what part of his experimental results implied this idea

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour