Question

multiple - choice question
why do we disregard the noble gasses for electron affinity?
they have positive numbers so they do not fit the trend.
they follow the octet rule with 8 valence electrons
they want to lose electrons not gain

Explanation:

Noble gases have a full - valence shell of 8 electrons (except helium which has 2) and follow the octet rule. They are very stable and have little tendency to gain electrons, which is what electron - affinity measures. So, they are often disregarded in electron - affinity trends.

Answer:

they follow the octet rule with 8 valence electrons