The atom of an element `X` contains 27 electron `X` is expected to be

Options

A. a non-metal belonginig to p-block
B. paramagnetic belonging to d-block
C. diamagnetic belonging to d-block
D. an s-block element.

Answer

To determine the expected characteristics of the element `X` that contains 27 electrons, we can follow these steps:

### Step 1: Identify the Atomic Number
The number of electrons in a neutral atom is equal to its atomic number. Therefore, if element `X` has 27 electrons, its atomic number is also 27.

### Step 2: Find the Element Corresponding to Atomic Number 27
Using the periodic table, we can identify that the element with atomic number 27 is cobalt (Co).

### Step 3: Determine the Electronic Configuration
Next, we can write the electronic configuration for cobalt. The atomic number 27 means cobalt has 27 electrons, and its electronic configuration is:
- 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁷

### Step 4: Analyze the d-Block Characteristics
Cobalt is located in the d-block of the periodic table, specifically in the 3d series.

### Step 5: Determine the Number of Unpaired Electrons
In the 3d subshell, cobalt has 7 electrons. The distribution of these electrons in the 3d orbitals is as follows:
- 3d: ↑↓ ↑ ↑ ↑ ↑ ↑ (7 electrons, with three unpaired electrons)

### Step 6: Conclude the Magnetic Properties
Since cobalt has unpaired electrons, it is classified as a paramagnetic substance. The number of unpaired electrons (n) is 3.

### Final Answer
Thus, element `X` is expected to be cobalt (Co), a paramagnetic d-block element.

---