Questions: A M^2+ ion has five electrons in the 3d subshell and is derived from a metal in the first transition metal series. Based on the description provided, enter a chemical symbol for what element M might be.

A M^2+ ion has five electrons in the 3d subshell and is derived from a metal in the first transition metal series. Based on the description provided, enter a chemical symbol for what element M might be.

Transcript text: $\mathrm{A} \mathrm{M}^{2+}$ ion has five electrons in the $3 d$ subshell and is derived from a metal in the first transition metal series. Based on the description provided, enter a chemical symbol for what element M might be.

Solution

Solution Steps

Step 1: Determine the Electron Configuration of the Ion

The ion $\mathrm{M}^{2+}$ has five electrons in the $3d$ subshell. This means the electron configuration of the ion is $3d^5$.

Step 2: Determine the Electron Configuration of the Neutral Atom

Since the ion is $\mathrm{M}^{2+}$, it has lost two electrons compared to the neutral atom. Therefore, the neutral atom $\mathrm{M}$ would have two more electrons than the ion, making its electron configuration $3d^5 4s^2$.

Step 3: Identify the Element

The electron configuration $3d^5 4s^2$ corresponds to the element Manganese (Mn) in the periodic table. Manganese is in the first transition metal series and has an atomic number of 25.

Final Answer

$\boxed{\text{Mn}}$

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