An element with atomic number 29 belongs to

Options

A. 1. s-block
B. 2. p-block
C. 3. d-block
D. 4. f-block

Answer

To determine which block the element with atomic number 29 belongs to, we will follow these steps:

### Step 1: Identify the Element
The atomic number 29 corresponds to the element Copper (Cu).

### Step 2: Write the Electronic Configuration
Next, we need to write the electronic configuration for Copper (Cu). The atomic number tells us the total number of electrons, which is also 29.

The electronic configuration can be written as:
- 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹

However, Copper is an exception in electronic configuration. It actually has:
- 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰

### Step 3: Determine the Last Electron's Orbital
In the electronic configuration, we observe that the last electron is placed in the 3d orbital (3d¹⁰).

### Step 4: Identify the Block
Elements are classified into blocks based on the subshell that is being filled with the last electron:
- s-block: Last electron in s orbital
- p-block: Last electron in p orbital
- d-block: Last electron in d orbital
- f-block: Last electron in f orbital

Since the last electron for Copper is in the 3d orbital, we conclude that Copper belongs to the d-block.

### Conclusion
Thus, the element with atomic number 29 (Copper) belongs to the d-block.

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