Question

the noble gases include helium, neon, argon, krypton, xenon, and radon. what property do these elements share?
a. they readily form compounds with other elements.
b. they are normally unreactive with other elements.
c. they are never found in the earths atmosphere.
d. they were discovered in ancient times.

Explanation:

Noble gases have a full outer - electron shell, which makes them very stable and unreactive under normal conditions. They do not readily form compounds with other elements. Helium, neon, argon, krypton, xenon are present in the Earth's atmosphere in trace amounts and radon is a radioactive gas that can be found in some soil and rocks. Noble gases were not discovered in ancient times as they are inert and required modern scientific techniques for their discovery.

Answer:

B. They are normally unreactive with other elements.