According to the modern periodic table, the number of electrons in the valence shell of an atom represents its _______in the periodic table.

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Solution

According to the modern periodic table, the number of electrons in the valence shell of an atom represents its valency in the periodic table.
The number of valence electrons remains equal to the number of groups to which the element belongs. Valency is the combining power of the atom. It depends mostly on the electrons in the outermost orbit. Thus the number of valence electrons represents valency.
Therefore, according to the modern periodic table, the number of electrons in the valence shell of an atom represents its valency in the periodic table.

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