GK
THE UNIVERSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They all have an odd number of protons.
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They all have an even number of protons.
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They have the largest masses.
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Their electron shells are the most filled and do not need to be very reactive.
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Detailed explanation-1: -Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. Noble gases are the least reactive of all elements. That’s because they have eight valence electrons, which fill their outer energy level.
Detailed explanation-2: -Noble gases ( group 18 elements) are chemically inert with low reactivity due to stable configuration (completely filled valence electron) with zero valency like He, Ne, Ar, Kr. So, noble gas does not combine with other elements. Argon is a noble gas so it is least chemically reactive.
Detailed explanation-3: -Noble gases have eight valence electrons, that is, they have eight electrons in their outermost orbit (except helium). Thus, they exhibit stable octet or duplet configuration. Hence, the elements of group 18 exhibit very high ionization enthalpies.