Question

Which place in Mendeleev's periodic table should chlorine be placed?

Answer 1

In Mendeleev,'s Periodic Table the two isotopes of chlorine, Cl-35 and Cl-37 would be placed in different slots because they have different atomic masses. But because of their similar chemical properties which is a more reliable property as it is based on the number of valence electrons, they would be placed in the same slot.
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