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Explain why helium (He) is stable (unreactive), but hydrogen (H) is unstable (reactive)
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Explain why helium (He) is stable (unreactive), but hydrogen (H) is unstable (reactive)

User Giacomo Penuti
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Answer:

Helium is stable because it has 1 shell and the first shell can only have 2 electrons. Hydrogen is unstable because it has 1 shell but only 1 electron.

User Shamal Karunarathne
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