Which of the following is not true in regard to noble gases?
a. these elements tend to be relatively inactive
b. these elements tend to gain or lose electrons easily
c. these elements are found in the last column (group 18) on the periodic table
d. these elements have full outermost shells

The answer is b. elements react because they want to gain a full outer shell of electrons (or in other words, to have 8 valence electrons). because noble gases already have 8 valence electrons, they don't need to gain any more/won't give them up easily.

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Explanation: