Mendeleev noticed that if he organized the elements by atomic weight certain patterns emerged. for instance, elements in the same group (family) appeared to have the same a) valence. b) melting point. c) isotopic ratio. d) number of neutrons.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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