Why do some of the noble gases still make compounds and react even though they have completed octet.(Not a school question, just for knowledge)
Answers
If you take a close look at the periodic table, you'll notice a very special column all the way on the right hand side. In this column are some very unique elements called the noble gases. These are helium, neon, argon, krypton, xenon, and radon. All of the noble gases are grouped together because they are virtually non-reactive. And, legend has it that the term 'noble' came from earlier times when nobility didn't interact with 'common folk.' These gases are so non-reactive, in fact, that they're sometimes called inert.
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Answer:
Because the noble gases are the least reactive of all elements, their eight valence electrons are used as the standard for non-reactivity, and to explain how other elements interact. This is stated as the octet ("group of eight") rule. According to this rule, atoms react to form compounds that allow them to have a group of eight valence electrons like the noble gases. For example, sodium (with one valence electron) reacts with chlorine (with seven valence electrons) to form the stable compound sodium chloride (table salt). In this reaction, sodium donates an electron and chlorine accepts it, giving each element an octet of valence electrons.