We use this method because when Mendeleev used atomic weight it made some of the elements skewed. For example, if you take the elements Te (Tellurium) and I (Iodine) they would not be in the correct order according to atomic weight, Te and I would need to be reversed. If they were reversed, then Iodine would not be in the same column as the other halogens. This is the reason we now arrange the elements of the periodic table according to increasing atomic
We use this method because when Mendeleev used atomic weight it made some of the elements skewed. For example, if you take the elements Te (Tellurium) and I (Iodine) they would not be in the correct order according to atomic weight, Te and I would need to be reversed. If they were reversed, then Iodine would not be in the same column as the other halogens. This is the reason we now arrange the elements of the periodic table according to increasing atomic