The trend which does not vary periodically in the periodic table is; Symbol of elements.
Periodic Trends in the periodic table
The periodic table of elements is a systematic arrangement of elements in order of increasing atomic number. The periodic table is made up of columns which are termed groups and rows which are termed periods.
Several element characteristics vary periodically across a period or down a group. Such characteristics of elements include: electron affinity, electronegativity, atomic radius, ionic radius and so on.
The symbol of elements on the other hand is characteristic of each element but does not vary periodically in the periodic table.
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