What is the proton (atomic number) of an element that has four unpaired electrons in its ground state?
Correct answer: D. 26
- A. 6
- B. 14
- C. 22
- D. 26
Explanation
The number of unpaired electrons in an element's ground state corresponds to the element's atomic number, which is the number of protons in its nucleus. In this case, an element with four unpaired electrons would have an atomic number of 26. Iron has an atomic number of 26; it has four unpaired electrons in its ground state electronic configuration:1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d⁶
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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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