Which of the following order is valid for
`LiltBltBeltCltOltNltFltNe`

Options

A. IE
B. EGE
C. EN
D. size

Answer

To determine the valid order for the elements lithium (Li), boron (B), beryllium (Be), carbon (C), oxygen (O), nitrogen (N), chlorine (Cl), and neon (Ne), we need to analyze the properties of these elements in terms of ionization energy, electron gain enthalpy, electronegativity, and atomic size.

### Step-by-Step Solution:

1. **Understanding Ionization Energy**:
- Ionization energy is the energy required to remove an electron from an isolated atom. It generally increases across a period from left to right due to increasing nuclear charge and decreases down a group due to increased distance of the outermost electrons from the nucleus.

2. **Analyzing the Elements**:
- The elements listed are: Li, B, Be, C, O, N, Cl, and Ne.
- These elements span across periods 1 and 2, with the exception of Cl, which is in period 3.

3. **Order of Ionization Energy**:
- For period 2 elements (Li, Be, B, C, N, O, F, Ne):
- **Li** has the lowest ionization energy because it is the furthest left.
- **Be** has a higher ionization energy than Li due to its filled 2s orbital.
- **B** has a lower ionization energy than **C** because removing an electron from B disrupts its stable configuration.
- **C** has a higher ionization energy than **B** and lower than **N**.
- **N** has a higher ionization energy than **O** due to its half-filled p subshell, which is more stable.
- **O** has a higher ionization energy than **F**.
- **Ne** has the highest ionization energy due to its complete octet.

4. **Final Order**:
- The correct order of ionization energy for these elements is:
- **Ne > F > O > N > C > Be > B > Li**

5. **Conclusion**:
- Therefore, the valid order for the given elements is related to ionization energy (IE).