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Q. |
The noble gases are a group of chemical elements with very similar properties: under standard conditions, they are all odorless, colorless, monatomic gases, with a very low chemical reactivity. How many Noble gases occur naturally? |
A. | 5 |
B. | 6 |
C. | 7 |
D. | 8 |
Answer» B. 6 |
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General Science