Question

1 2 3 4 5 6 7 8 9 10TIME REMAINING52:51While developing his periodic table, Dmitri Mendeleev broke his own rule and placed the element tellurium before iodine in the group. He did this even though tellurium's atomic mass was known to be greater than iodine's. In his notes, Mendeleev stated that he expected tellurium to have a lower atomic mass than iodine. However, all measurements continue to show that tellurium has a greater atomic mass than iodine even though tellurium acts like it has a lower atomic mass
What is the most likely reason that Mendeleev placed tellurium before iodine?

Answer 1

Since, Mendeleev noticed that Tellurium has chemical properties like the other elements included in the same group; he did not know that neutrons can affect atomic mass. Therefore, Mendeleev's Tellurium and Iodine aberration happened because the Tellurium that he got has a prevalence of a heavier Tellurium isotope making it a greater weight than Iodine.