All gases below are monoatomic except:
Correct answer: A. H
- A. H
- B. He
- C. Ne
- D. Xe
Explanation
Hydrogen is the only gas listed that is diatomic, meaning its molecules consist of two atoms (H2). The other gases, helium (He), neon (Ne), and xenon (Xe), are all noble gases and exist as single, monoatomic entities. This is due to their stable electron configurations, which do not easily form compounds or molecules under standard conditions.
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About Kinetic Molecular Theory
Kinetic molecular theory explains gases as rapidly moving particles separated by large distances, with negligible volume and negligible intermolecular attraction in the ideal model. It relates temperature to average kinetic energy and explains gas pressure, Boyle's and Charles's laws, diffusion, effusion and the conditions under which real gases deviate from ideal behavior.
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