The periodic table of the elements in its modern form was first prepared in the late 1800’s. This arrangement was slightly changed a few decades later. This allowed the development of the Periodic Law which states that when the elements are arranged by increasing atomic numbers, the properties tend to repeat. Many of the chemical and physical properties of the elements change in a regular fashion, with successive elements in either the same row or the same column of this table. Name three quantifiable properties, other than atomic weight or atomic number, that change in the manner described. How do each of these properties change across rows and down columns in the table? Explain, in terms of atomic structure, why each of these changes occurs in the manner observed.
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