An element of atomic number 29 belongs to which of the following block of the periodic table ?

Options

A. s-block
B. p-block
C. f-block
D. d-block

Explanation

To determine which block of the periodic table the element with atomic number 29 belongs to, follow these steps:

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

### Step 2: Write the Electron Configuration
The electron configuration of Copper is:
\[ \text{Cu: } [\text{Ar}] 3d^{10} 4s^{1} \]

### Step 3: Determine the Last Electron Shell
In the electron configuration, the last electron is in the 4s subshell. However, the 3d subshell is also filled.

### Step 4: Identify the Block
Elements are classified into blocks based on the subshell that contains the last electron:
- **s-block**: Last electron in s subshell
- **p-block**: Last electron in p subshell
- **d-block**: Last electron in d subshell
- **f-block**: Last electron in f subshell

In the case of Copper, the last electron is in the 3d subshell, which means Copper belongs to the d-block of the periodic table.

### Conclusion
Therefore, the element with atomic number 29 (Copper) belongs to the **d-block** of the periodic table.

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