Explain why the electron configuration of 2-3-1 represents an atom in an excited state.

The excited state electron configuration of an atom indicates the promotion of a valence electron to a higher energy state.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

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