How many moles of sodium (na) do you have in a sample of 9.8 × 1023 atoms na? 0.61 mol na 1.6 mol na 5.9 mol na 16.3 mol na

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.

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock