If you start with 6.5 x 10^10 I-131 atoms, how many are left after approximately 1 month? I -131 has a half-life of 8.0 days.

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.

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;