What is the general electronic configuration for second row transition series?

Options

A. `[Ne]3d^(1-10), 4s^2`
B. `[Ar]3d^(1-10), 4s^(1-2)`
C. `[Kr]4d^(1-10), 5s^(1-2)`
D. `[Xe]5d^(1-10), 5s^(1-2)`

Answer

To find the general electronic configuration for the second row transition series, we need to follow these steps:

### Step-by-Step Solution:

1. **Identify the Period**: The second row transition series corresponds to the fifth period of the periodic table.

2. **Understand the Transition Metals**: The transition metals in the fifth period start from Yttrium (Y, atomic number 39) and end at Cadmium (Cd, atomic number 48).

3. **Noble Gas Core**: The preceding noble gas before the fifth period is Krypton (Kr), which has an atomic number of 36. Therefore, the electronic configuration will start from Kr.

4. **Determine the Electron Filling Order**: The general filling order for transition metals involves filling the 4d subshell after the 5s subshell. The general electronic configuration can be expressed as:
- 5s² for the two electrons in the 5s subshell.
- 4d¹ to 4d¹⁰ for the electrons in the 4d subshell, depending on the specific element in the transition series.

5. **General Electronic Configuration**: Thus, the general electronic configuration for the second row transition series is:
\[ [Kr] \, 5s^2 \, 4d^{1-10} \]
where \( 4d \) can have values from 1 to 10 depending on the specific element.

### Final Answer:
The general electronic configuration for the second row transition series is:
\[ [Kr] \, 5s^2 \, 4d^{1-10} \]