How many mols of Ti is 3.15 * 10^23 atoms of Titanium
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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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i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a