1.The atomic masses of two isotopes are given that is 203Tl and 205Tlare 202.972320 and 204.974401 amu, respectively. Determine the natural abundances of two isotopes. When the average atomic mass of thallium is 204.4 amu.
2.The atomic masses of tow isotopes 3517Cl (75.53%) and 3717Cl (24.47%) are 34.968 and 36.956amu, respectively. Determine the average atomic mass of chlorine. When the % (percentage) in parentheses indicate the relative abundances.