Question

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Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?​

Answer 1

Answer:

The sixth is naturally occuring noble gas are

Explanation:

(1) Helium (He)

(2) Neon (Ne)

(3)Argon(Ar)

(4)Krypton(Kr)

(5)Xenon(Xe)

and the

(6)Redioactive Radon(Rn)

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Answer 2

Explanation:

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