49) An unknown element is found to have three naturally occurring isotopes with atomic masses of 35.9675 (0.337% ) , 37.9627 (0.063% ) and 39.9624(99.600% ) Which of the following is the unknown element? A) Ar B) K C) Cl D) Ca E) None of the above could be the unknown element.

To determine the unknown element, we need to consider the given isotopic masses and their respective abundances. The element with atomic masses of 35.9675, 37.9627, and 39.9624, and the given abundances of 0.337%, 0.063%, and 99.600% respectively, corresponds to chlorine (Cl). Therefore, the correct answer is:<br /><br />C) Cl