In the modern periodic table, elements in the same group have the same:

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Elements in the same group (vertical column) have the same number of valence electrons, resulting in similar chemical properties. For example, all Group 1 elements have 1 valence electron (ns¹). The number of shells increases down the group. Atomic mass varies. This similarity was the basis for Mendeleev's grouping. Modern table uses atomic number for ordering.

In the modern periodic table, elements in the same group have the same: MCQ with Answer and Explanation

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