Question

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

Explanation:

The noble gases (helium, neon, argon, krypton, xenon, radon) are known for their low reactivity. Option A is wrong as they are in Earth’s atmosphere. Option B is incorrect as their discovery timeline isn't a defining shared property. Option C is wrong because they rarely form compounds. Option D correctly states they are normally unreactive (due to full valence electron shells).

Answer:

D. They are normally unreactive with other elements.