Which of the following is a mixture? water concrete iron mercury
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<span>The elements for which the neutral atom has a valence electron configuration of .
are those whose valence electron shell has 2 + 6 = 8 electrons.
Those are the noble gases, except helium (He).
Here is the list of the noble gases and the configuration of their valence electron configuration:
He:
Ne
Ar
Kr
Xe
Rn
Answer: Ne, Ar, Kr, Xe and Rn
</span>
are those whose valence electron shell has 2 + 6 = 8 electrons.
Those are the noble gases, except helium (He).
Here is the list of the noble gases and the configuration of their valence electron configuration:
He:
Ne
Ar
Kr
Xe
Rn
Answer: Ne, Ar, Kr, Xe and Rn
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