Total number of elements of 6th period which have one or more than one 4d electrons :-

Options

A. 10
B. 16
C. 32
D. Zero

Explanation

To find the total number of elements in the 6th period that have one or more than one 4d electrons, we can follow these steps:

### Step 1: Identify the Elements in the 6th Period
The 6th period of the periodic table consists of the following elements:
- Cesium (Cs)
- Barium (Ba)
- Lanthanides (elements from Cerium (Ce) to Lutetium (Lu))

### Step 2: Determine the Electronic Configuration
The electronic configuration of the elements in the 6th period can be derived from the nearest noble gas, which is Xenon (Xe). The electronic configuration of Xenon is:
\[ \text{Xe: } 1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 4s^2 \, 3d^{10} \, 4p^6 \]

For the elements in the 6th period:
- **Cesium (Cs)**: \[ \text{Xe} \, 6s^1 \]
- **Barium (Ba)**: \[ \text{Xe} \, 6s^2 \]
- **Lanthanides**: These elements will fill the 4f orbitals and will also have electrons in the 4d orbitals.

### Step 3: Identify the 4d Electrons
The 4d subshell can hold a maximum of 10 electrons. In the 6th period, the elements that have 4d electrons are primarily the transition metals and the lanthanides. The relevant elements are:
- **Zirconium (Zr)**: \[ \text{Xe} \, 6s^2 \, 4f^{14} \, 5d^2 \] (not in 4d)
- **Ruthenium (Ru)**: \[ \text{Xe} \, 6s^2 \, 4f^{14} \, 5d^7 \] (not in 4d)
- **Rhodium (Rh)**: \[ \text{Xe} \, 6s^2 \, 4f^{14} \, 5d^8 \] (not in 4d)
- **Palladium (Pd)**: \[ \text{Xe} \, 6s^2 \, 4f^{14} \, 5d^{10} \] (not in 4d)
- **Silver (Ag)**: \[ \text{Xe} \, 6s^2 \, 4f^{14} \, 5d^{10} \] (not in 4d)
- **Cadmium (Cd)**: \[ \text{Xe} \, 6s^2 \, 4f^{14} \, 5d^{10} \] (not in 4d)

### Step 4: Count the Elements with 4d Electrons
The elements that have one or more than one 4d electrons in the 6th period are:
- Lanthanides (from Cerium (Ce) to Lutetium (Lu)) which include 14 elements.
- The transition metals in the 5d block also contribute to the count.

### Conclusion
The total number of elements in the 6th period that have one or more than one 4d electrons is 32 (including the lanthanides).

### Final Answer
The total number of elements of the 6th period which have one or more than one 4d electrons is **32**.

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