The number of electrons in the valence shell of an atom is equal to the group number for the representative elements.

Name: The number of electrons in the valence shell of an atom is equal to the group number for the representative elements.
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Quizplus · Accepted Answer

This is true for representative elements in the periodic table, also known as group A elements. These elements have their valence shell electrons in the outermost s and p orbitals, and the number of valence electrons is equal to the group number.

The Number of Electrons in the Valence Shell of an Atom