Noble gases, such as argon and neon, are known for being extremely non-reactive. neon and argon are non-reactive because they a. have six electrons in their outer shell. b. have eight electrons in their outer shell. c. have ten electrons in their outer shell. d. have 18 electrons in their outer shell.

B. Have eight electrons in their outer shell.

Explanation:

Noble gases are known for their unreactive nature due to the presence of complete outermost electron. They possess eight electrons in their outermost shell (octet rule). Being unreactive means that they cannot share any of their outermost electron to any other atoms since they are completely filled up (stable).

Taking sodium(2 8 1) which is reactive as an example, its reactivity is due to the presence of a lone pair of electron in its outermost shell which it can easily share to other atom with incomplete outermost electron like chlorine (2 8 7).

it doesn't. it was imagined up in the middle ages.