Final answer:
Radon is the colorless and tasteless gas that cannot be readily detected by the senses, and it is also radioactive and potentially harmful.
Step-by-step explanation:
The colorless and tasteless gas that cannot be readily detected by the senses is radon. Radon is an invisible, odorless noble gas that is released from the ground, especially from rocks and soils with a high uranium content. Unfortunately, radon is also radioactive and exposure to high levels of radon has been linked with an increased risk of lung cancer. Unlike gases like carbon monoxide or household natural gas, which may have odors that can be detected, radon does not possess a smell or taste that can alert us to its presence. It is crucial to be aware of radon and have homes tested, as it is harmful and can accumulate over time without detection.