Answer:Artificial light from cities has created a permanent "skyglow" at night, obscuring our view of the stars. Here's their map of artificial sky brightness in North America, represented as a ratio of "natural" nighttime sky brightness. In the black areas, the natural night sky is still (mostly) visible.
Explanation:
Moles of N2O5 = moles of NO2 * ( 2 moles of N2O5 / 4 moles of NO2
The number of energy levels to which an electron can jump depends on the amount of energy the electron possesses. Each energy level has a specific amount of energy an electron needs to have before it can be in there. So, if an electron doesn't have enough energy to be in that energy level then it won't jump to that higher level.
<span>1s2, 2s2, 2p6, 3s2, 3p6, 3d5</span>
When two oxygen atoms get close to each other, the attractions from the nucleus of both atoms attract the outer electrons.
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