OSAS Science Grade 11 Practice Questions - Oregon Statewide Assessment System - Science, Grade 11 Exam

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A student builds a model of a sodium atom showing 11 protons and electrons arranged in energy levels of 2, 8, and 1. When sodium forms a stable ion, which best explains the change using the model?

Sodium gains 7 electrons to fill its outermost level Sodium loses 1 electron to achieve a full outer level Sodium shares its 1 outer electron with another atom in an ionic bond Sodium gains 1 proton to become magnesium

Correct Answer:

Sodium loses 1 electron to achieve a full outer level

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