A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Why does tellurium come before iodine in the periodic table?

Best Answers

For example, iodine has a lower relative atomic mass than tellurium, so it should come before tellurium in Mendeleev's table. In order to get iodine in the same group as other elements with similar properties such as fluorine, chlorine and bromine, he had to put it after tellurium, so breaking his own rules. read more

Iodine's atomic number is 53 whereas tellurium's is 52. Atomic number is basically the number of protons that an element has. Therefore, as iodine has more protons than tellurium, it appears later in the table. read more

Encyclopedia Research

Wikipedia:

Related Types