Which statement about noble gases at room temperature is true?

Which statement about noble gases at room temperature is true?

• A. They exist as diatomic molecules
• B. They exist as monoatomic species at room temperature
• C. They are always colored
• D. They have high chemical reactivity

Answer: (B)

Noble gases have complete outer electron shells, which makes them unusually stable and unwilling to form bonds. Because of this, they don’t pair up into molecules under normal conditions; they stay as individual atoms in the gas phase at room temperature. These elements are colorless and odorless gases and are very unreactive, not colored and not highly reactive. So the description that they exist as monoatomic species at room temperature is the accurate one.

Noble gases have complete outer electron shells, which makes them unusually stable and unwilling to form bonds. Because of this, they don’t pair up into molecules under normal conditions; they stay as individual atoms in the gas phase at room temperature. These elements are colorless and odorless gases and are very unreactive, not colored and not highly reactive. So the description that they exist as monoatomic species at room temperature is the accurate one.