How do the metallic properties of simple substances change during the period?

The metallic properties of the elements in the period from left to right weaken, and in groups from top to bottom they increase. Non-metallic properties of elements in the period from left to right increase, and in groups from top to bottom they weaken. Thus, sodium is a typical metal on the left in the table, carbon already exhibits the properties of a non-metal, and fluorine is the strongest non-metal.



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