the atomic mass of fluorine is 18.998 amu and its mass spectrum shows a large peak at this mass. the atomic mass of chlorine is 35.45 amu, yet the mass spectrum of chlorine does not show peak at this mass. Explain the difference.

Question

unklerhaukus · Answer

$\text F$ is mostly    $_{9}^{19}\text F_{10}$



$\text {Cl}$ is a mix of ~76%   $_{17}^{35}\text {Cl}_{18}$

                 and ~24%  $_{17}^{37}{\text {Cl}}_{20}$