Monoatomic molecule among the following is

Question

Accepted Answer

The correct answer to the question "Monoatomic molecule among the following is" is Option 1: Argon. Here is a detailed explanation supporting this choice:

1. **Explanation for Option 1: Argon**
   - Argon is a noble gas, which is found in Group 18 of the periodic table. Noble gases are characterized by their complete valence electron shells, which make them highly stable and unreactive. As a result, they exist naturally as monoatomic gases, meaning each molecule consists of a single atom. Argon, like other noble gases such as helium, neon, and krypton, is monoatomic in its natural state.

2. **Explanation for why other options are incorrect:**

- **Option 2: Hydrogen**
     - Hydrogen naturally exists as a diatomic molecule, denoted as H₂. This means that two hydrogen atoms bond together to form a stable molecule. The diatomic nature of hydrogen is due to its need to achieve a stable electron configuration by sharing electrons with another hydrogen atom.

- **Option 3: Oxygen**
     - Oxygen is also a diatomic molecule in its natural state, represented as O₂. Like hydrogen, oxygen atoms pair up to form a stable molecule by sharing electrons. This diatomic form is essential for the molecule's stability and is the form in which oxygen is commonly found in the Earth's atmosphere.

- **Option 4: Ozone**
     - Ozone is a triatomic molecule, consisting of three oxygen atoms bonded together, represented as O₃. It is a different allotrope of oxygen and is not monoatomic. Ozone is known for its role in the Earth's atmosphere, particularly in the ozone layer, where it absorbs harmful ultraviolet radiation.

In conclusion, Argon is the only option among the given choices that exists naturally as a monoatomic molecule, which is why Option 1 is the correct answer.