Position of the elements in the periodic table:
How did the position of `._(17)^(35)CI` and `._(17)^(37)CI` get fixed in the modern periodic table?

Explanation

In the modern periodic table, the elements are arranged in the order of increasing atomic numbers. All the isotopes of an element have same atomic number. Therefore, isotopes `._(17)^(35)CI` and `._(17)^(37)CI` having same atomic number, which is equal to 17, will be placed at the same position in the modern periodic table.