Question

which feature is unique to group 18 nonmetals? (1 point)
o they have more exceptions to reactivity rules.
o they are very reactive.
o they are very nonreactive.
o they follow a different pattern of reactivity.

Explanation:

Group 18 elements (noble gases) have a full valence electron shell. This makes them very nonreactive as they do not easily gain, lose, or share electrons. Other groups may have more reactive elements (like Group 1 is very reactive) or have some patterns with exceptions (but Group 18's non - reactivity is a distinct and unique feature).

Answer:

They are very nonreactive.