When considering the noble gases in the Earth's atmosphere, it is important to note their presence and abundance. Here’s a breakdown of the given options:

1. **Radon** - This is a radioactive noble gas that is not commonly found in the atmosphere. Its presence is usually localized due to its formation from the decay of uranium in the earth's crust.

2. **Argon** - This is the third most abundant gas in the Earth's atmosphere, making up about 0.93% of the air we breathe.

3. **Helium** - While helium is naturally occurring in the atmosphere, it is present in very trace amounts (about 0.0005%).

4. **Neon** - Like helium, neon is also present in trace amounts (roughly 0.0018%) in the atmosphere.

Considering the information above, the correct answer is:

### Final Answer
**Radon** is the noble gas that is not present in the air in significant quantities.

Question

When considering the noble gases in the Earth's atmosphere, it is important to note their presence and abundance. Here’s a breakdown of the given options:

1. **Radon** - This is a radioactive noble gas that is not commonly found in the atmosphere. Its presence is usually localized due to its formation from the decay of uranium in the earth's crust.
  
2. **Argon** - This is the third most abundant gas in the Earth's atmosphere, making up about 0.93% of the air we breathe.

3. **Helium** - While helium is naturally occurring in the atmosphere, it is present in very trace amounts (about 0.0005%).

4. **Neon** - Like helium, neon is also present in trace amounts (roughly 0.0018%) in the atmosphere.

Considering the information above, the correct answer is:

### Final Answer
**Radon** is the noble gas that is not present in the air in significant quantities.

Knowee AI · Accepted Answer

When considering the noble gases in the Earth's atmosphere, it is important to note their presence and abundance. Here’s a breakdown of the given options:

1. **Radon** - This is a radioactive noble gas that is not commonly found in the atmosphere. Its presence is usually localized due to its formation from the decay of uranium in the earth's crust.
  
2. **Argon** - This is the third most abundant gas in the Earth's atmosphere, making up about 0.93% of the air we breathe.

3. **Helium** - While helium is naturally occurring in the atmosphere, it is present in very trace amounts (about 0.0005%).

4. **Neon** - Like helium, neon is also present in trace amounts (roughly 0.0018%) in the atmosphere.

Considering the information above, the correct answer is:

### Final Answer
**Radon** is the noble gas that is not present in the air in significant quantities.

Which one of the following Noble Gases is not present in the air?*1 pointRadonArgonHeliumNeon

Question

Which one of the following Noble Gases is not present in the air?

Solution

Final Answer

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