Which pair of Non-Metal - Atomicity is NOT correct? I. Hydrogen - Monoatomic II. Oxygen - Diatomic
Understanding Non-Metal Atomicity
Atomicity refers to the number of atoms present in one molecule of an element. Elements can exist in different forms depending on how their atoms bond together.
Let's examine the atomicity of common non-metals mentioned in the question:
Analyzing Statement I: Hydrogen - Monoatomic
Statement I says Hydrogen is monoatomic. This means a molecule of Hydrogen would consist of a single Hydrogen atom ($\text{H}$). However, Hydrogen typically exists as a diatomic molecule, meaning it consists of two Hydrogen atoms covalently bonded together ($\text{H}_2$). Monoatomic elements usually include noble gases (like Helium, Neon, Argon) because they are stable as single atoms.
Therefore, the statement "Hydrogen - Monoatomic" is incorrect.
Analyzing Statement II: Oxygen - Diatomic
Statement II says Oxygen is diatomic. This means a molecule of Oxygen consists of two Oxygen atoms covalently bonded together ($\text{O}_2$). Oxygen commonly exists in the atmosphere as diatomic molecules.
Therefore, the statement "Oxygen - Diatomic" is correct.
Comparing the Pairs
We are looking for the pair of Non-Metal - Atomicity that is NOT correct.
- Pair I: Hydrogen - Monoatomic. We found this statement to be incorrect.
- Pair II: Oxygen - Diatomic. We found this statement to be correct.
To summarize:
| Non-Metal | Stated Atomicity | Actual Common Atomicity | Correctness of Statement |
|---|---|---|---|
| Hydrogen | Monoatomic | Diatomic ($\text{H}_2$) | Incorrect |
| Oxygen | Diatomic | Diatomic ($\text{O}_2$) | Correct |
The question asks which pair is NOT correct. Based on our analysis, only Statement I, "Hydrogen - Monoatomic", is incorrect.
Therefore, the pair of Non-Metal - Atomicity that is NOT correct is the first one.
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