The first ionization energy of neon is 2080.7 KJ/mole. The first of ionisatioin energy of helium may be 

Options

A. 2080.7 KJ/mole
B. 2372.3 KJ/mole
C. 1520.5 KJ/mole
D. 1800.4 KJ/mole

Answer

To determine the first ionization energy of helium based on the given first ionization energy of neon, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Ionization Energy Trend**:
- Ionization energy is the energy required to remove an electron from an atom in its gaseous state.
- In the periodic table, as you move down a group (column), the ionization energy generally decreases due to the increase in atomic size and the shielding effect.

2. **Identify the Position of Neon and Helium**:
- Neon (Ne) is located in period 2 of Group 18 (noble gases).
- Helium (He) is located in period 1 of Group 18 (noble gases).

3. **Compare the Ionization Energies**:
- Since helium is above neon in the periodic table, it is expected to have a higher ionization energy than neon.
- The first ionization energy of neon is given as 2080.7 kJ/mole.

4. **Estimate Helium's Ionization Energy**:
- Given that helium is expected to have a higher ionization energy than neon, we can estimate that it will be greater than 2080.7 kJ/mole.
- However, the exact value is not provided, so we need to consider typical values for helium.

5. **Use Known Values**:
- The first ionization energy of helium is known to be approximately 2372.3 kJ/mole. This is a commonly accepted value in chemistry.

6. **Conclusion**:
- Therefore, the first ionization energy of helium is approximately **2372.3 kJ/mole**.

### Final Answer:
The first ionization energy of helium may be **2372.3 kJ/mole**.