QuestionIdentify the correct isotope symbol from the options: (a) ${ }_{71}^{35} \mathrm{Br}$, (b) ${ }_{27}^{24} \mathrm{Co}$, (c) ${ }_{52}^{105} \mathrm{Te}$, (d) ${ }_{20}^{45} \mathrm{Sc}$.

Studdy Solution
(d) ${ }_{20}^{45} \mathrm{Sc}$For this isotope, the atomic number Z is20 and the chemical symbol is Sc. According to the periodic table, the atomic number for Sc (Scandium) is21, not20. Therefore, this isotope symbol is incorrect.
The correct isotope symbol is (c) ${ }_{52}^{105} \mathrm{Te}$.