Which of the following statements concerning elements with atomic number 10 is true?

Options

A. it forms a covalent network solid
B. Element is monoatomic
C. It has a almost zero value of electron affinity
D. It has extremely high value of ionization energy

Answer

To determine which statement concerning elements with atomic number 10 is true, we first need to identify the element and its properties.

### Step-by-Step Solution:

1. **Identify the Element**:
- The element with atomic number 10 is Neon (Ne).

2. **Determine the Electronic Configuration**:
- The electronic configuration of Neon is 1s² 2s² 2p⁶. This shows that Neon has a total of 10 electrons.

3. **Analyze the Valence Shell**:
- The outermost shell (the second shell in this case) has 8 electrons (2 in the 2s subshell and 6 in the 2p subshell), which means it has a complete octet.

4. **Evaluate the Statements**:
- **Option 1**: "Forms a covalent network solid."
- This is incorrect because Neon is a noble gas and exists as a monoatomic gas, not forming covalent bonds or solids.

- **Option 2**: "Is monoatomic."
- This is correct. Neon exists as individual atoms and is classified as a monoatomic gas.

- **Option 3**: "Has almost zero value of electron affinity."
- This is also correct. Neon has a complete octet, so it does not tend to gain electrons, resulting in a very low electron affinity.

- **Option 4**: "Has extremely high value of ionization energy."
- This is correct as well. Neon has a high ionization energy due to its stable electronic configuration, making it difficult to remove an electron.

5. **Conclusion**:
- Options 2, 3, and 4 are true statements regarding Neon (atomic number 10). The question asks for which statement is true, and since multiple statements are true, we can conclude that at least one of them is correct.

### Final Answer:
The true statements concerning elements with atomic number 10 (Neon) are:
- It is monoatomic.
- It has almost zero value of electron affinity.
- It has extremely high value of ionization energy.