What Do These Four Elements Have In Common?

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What Do These Four Elements Have In Common?

They all have the same number of electrons in their first electron shell. They are all generally unreactive elements. They all have an incomplete valence electron shell. They all have the same number of protons in their nuclei
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They all have an incomplete valence electron shell: The valence shell is the outermost electron energy level. Valence shell electrons determine the reactivity of an element

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