Why is iodine placed after tellurium on the periodic table if the atomic mass of tellurium is ….?
The periodic table (and the name of elements) is based on the atomic number of number of protons so ANSWER A) B is the opposite so no and C and D are all about neutrons which alongside the protons contribute to the atomic mass but do not effect the positioning in the periodic table. One can’t even say that iodine has more or less neutrons than tellurium as it depends on the isotope. The listed atomic mass is the average mass of all the naturally occurring isotopes. On average Te does have 2 more neutrons than iodine because it has an average mass of 128 – 52 = 76 neutrons on average versus 127-53 = 74 neutrons on average for Iodine.
