Which electronic configuration corresponds to an element of group IIA?
Correct answer: D. 1s22s22p63s23p64s23d1
- A. 1s22s22p3
- B. 1s22s22p63s23p1
- C. 1s22s22p4
- D. 1s22s22p63s23p64s23d1
Explanation
(d) 1s2 2s2 2p6 3s2 3p6 4s2 3d1: This configuration includes a partially filled 3d orbital, which is not a characteristic of Group IIA elements. Their valence electrons reside solely in the s-orbital of their outermost energy level.Elements in Group IIA, also known as alkaline earth metals, have a specific electronic configuration with 2 valence electrons in their outermost s-orbital. This configuration gives them a +2 oxidation state and influences their chemical properties, such as their reactivity and tendency to form ionic compounds.
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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