PSSA Grade 8 Science Practice Questions - Pennsylvania System Of School Assessment (PSSA) Grade 8 Science Exam

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Why are elements in Group 18 of the periodic table (the noble gases like Neon and Argon) extremely unreactive under normal conditions?

They have only one valence electron that is easily lost. Their outermost energy levels are completely full with 8 valence electrons. They contain no protons in their nucleus. They are all metallic solids that resist chemical changes.

Correct Answer:

Their outermost energy levels are completely full with 8 valence electrons.

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