The oxidation number of elements becomes increasingly higher from left to right. Elements have more than one stable oxidation state as we move from left to right in the periodic table.
The periodic table contains an arrangements of elements in groups and periods. All elements in a group have similar chemical reactions while elements in the same period have the same highest energy level.
As we move from left to right in the periodic table, we notice that higher oxidation numbers of elements begin to appear. Also, we begin to see elements having more than one oxidation numbers.
Most main group metals on the left hand side of the table have only one stable oxidation number. However, across the period, higher oxidation numbers begin to appear.
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