What is the ground-state valence-shell electron configuration of the group of elements indicated by the shaded portion of the periodic table? A)ns² B)ns²^np² C)ns²(n-1)d² D)ns²(n-2)f²

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The shaded portion of the periodic table represents the p-block elements, specifically group 13 (which includes Boron, Aluminum, Gallium, Indium, and Thallium). The ground-state valence-shell electron configuration of these elements can be expressed as ns2np1, with n being the principal quantum number. Therefore, the correct answer is C, which shows the ns1 (where n=2), np1 configuration twice for the two elements in this block. The (n-1)d orbitals are not involved in the valence shell electron configuration of these elements. The f-orbitals do not start filling until the fourth row of the periodic table (in the lanthanide series). Choice A and B are incorrect because they include unnecessary orbitals, such as the np orbitals of higher energy levels and the (n-2)f orbitals.

What Is the Ground-State Valence-Shell Electron Configuration of the Group