Almost all of the energy on the surface of earth come from what

What happens to the atomic radius when an elctron is lost

Can someone me out on this question for my national 5 chemistry homework

6) (a) calculate the absorbance of the solution if its concentration is 0.0278 m and its molar extinction coefficient is 35.9 l/(mol cm). the depth of the cell is 5 mm. (b) what is the %t? (7) calculate the absorbance of the solution if the transmitted light intensity is 70% of the initial light beam intensity