Valency depends on the number of electrons present in the outermost orbital of an atom.
So, valency doesn't change as we move down the group in the modern periodic table because the elements in the same group have same number of electrons in their outermost atomic orbital.
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Explanation:
Valency depends on the number of electrons present in the outermost orbital of an atom.
So, valency doesn't change as we move down the group in the modern periodic table because the elements in the same group have same number of electrons in their outermost atomic orbital.