Identify that the structure of the periodic table based on increasing atomic number.

Identify all element pairs in the table that demonstrate the periodic table is ordered by increasing atomic number rather than increasing atomic mass.

In 1869, Dmitri Mendeleev organised elements primarily by increasing atomic mass. However, this resulted in anomalies where elements appeared to be in the wrong groups based on their chemical properties. For example, tellurium (atomic mass 127.6 u) was placed before iodine (atomic mass 126.9 u) to ensure both elements aligned with groups that matched their chemical behaviour. Identify the modern organising principle that resolved these anomalies. Explain your reasoning.

Identify the statement that correctly describes the basis for the arrangement of elements in the modern periodic table.