Chemistry
Grade-7
Easy
Question
Noble gases are mostly found ____________.
- In the atmosphere
- Underwater in the ocean
- Deep inside the Earth's crust
- In outer space
Hint:
Noble gases are inert gases.
The correct answer is: In the atmosphere
- Noble gas is the element in group 18 (VIIa) of the periodic table.
- The abundance of noble gases decreases with increasing atomic numbers.
- After hydrogen, helium is the most common element in the universe.
- All noble gases are present in the Earth's atmosphere and, with the exception of helium and radon, their main commercial source is air, from which they are extracted by liquefaction and fractional distillation.
- Most helium is commercially produced from certain natural gas sources.
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