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group 18 elements are what we call noble gasses. This means that their most outer shell called the valence shell has all 8 electrons.

The reason why other elements are reactive is because all elements want to have a full valence shell because it makes them more stable.

The noble gasses have a full shell so they are not very reactive.

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14y ago
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3y ago
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12y ago

Group 18 elements don't form compounds with other elements because they have their full octet (all 8 valence electons in their valence shell) so they have no reason to combine, they don't give up any electons and don't need to gain any electrons

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11y ago

The group 18 elements (the noble gases) have a completely filled set of orbitals with 8 valence electrons (this is very stable due to the Octet Rule). He, Ne and Ar have no known compounds but Kr and Xe which have vacant f orbitals can form compounds such as KrF4 and XeF4.

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11y ago

Because they already have full outer shells

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12y ago

Because their velence shell is stable

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Q: Why don't elements in group 18 usually form chemical bonds?
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