VTCAP Science Grade 11 Practice Questions - Vermont Comprehensive Assessment Program Science - Grade 11 Exam

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A student observes that lithium (Li) and sodium (Na) react vigorously with water, releasing hydrogen gas and forming basic solutions. Which property explains why these elements display similar chemical reactivity?

They have the same number of energy levels. They have the same number of valence electrons. They have equal atomic masses. They contain identical numbers of neutrons.

Correct Answer:

They have the same number of valence electrons.

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