The correct order of first ionization potential among following elements Be, B, C is

Options

A. `B lt Be lt C `
B. B = Be =C
C. `Be lt C lt B `
D. `Be lt B lt C `

Answer

To determine the correct order of first ionization potential among the elements Be (beryllium), B (boron), and C (carbon), we can follow these steps:

### Step 1: Understand Ionization Potential
Ionization potential (or ionization energy) is the energy required to remove the most loosely bound electron from an isolated gaseous atom. The greater the ionization energy, the more energy is required to remove an electron.

**Hint:** Remember that ionization energy increases across a period due to increased nuclear charge and decreased atomic size.

### Step 2: Analyze the Position of Elements in the Periodic Table
- Beryllium (Be) is in Group 2 (alkaline earth metals).
- Boron (B) is in Group 13 (p-block element).
- Carbon (C) is in Group 14 (p-block element).

**Hint:** Elements in the same period show trends in ionization energy based on their group and electronic configuration.

### Step 3: Consider Electronic Configurations
- Be: 1s² 2s²
- B: 1s² 2s² 2p¹
- C: 1s² 2s² 2p²

Beryllium has a fully filled 2s subshell, which makes it relatively stable. Boron has one electron in the 2p subshell, and carbon has two electrons in the 2p subshell.

**Hint:** Fully filled subshells are more stable and require more energy to remove an electron compared to partially filled subshells.

### Step 4: Compare Ionization Energies
- Beryllium (Be) has a higher ionization energy than Boron (B) because it has a completely filled 2s subshell, making it more stable.
- Boron (B) has a lower ionization energy than Carbon (C) because it has one less electron in the 2p subshell compared to Carbon, which means it is easier to remove an electron from Boron than from Carbon.

**Hint:** The stability provided by filled subshells affects the ease of removing electrons.

### Step 5: Establish the Order of Ionization Potentials
Based on the above analysis:
- The ionization potential of B < Be < C.

Thus, the correct order of first ionization potential among the elements Be, B, and C is:
**B < Be < C**

### Final Answer
The correct order of first ionization potential is:
**Boron (B) < Beryllium (Be) < Carbon (C)**