8. Element X has two known naturally occurring isotopes. The mass and relative abundance of each isotope are shown below.
Relative Abundance
50.57%
49.43%
Mass (amu)
78
81
What is the average atomic mass of Eleme-X to the nearest hundredth of an atomic mass unit?
79.04 amu
b. 79.48 amu
c.
d.
7948 amu
80.48 amu

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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