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

When a sodium atom (Na) reacts with a chlorine atom (Cl) to form table salt (NaCl), which process takes place?

Sodium and chlorine share a pair of electrons equally to form a covalent bond. Sodium gains an electron to become a negative ion, while chlorine loses an electron. Protons are transferred from the chlorine nucleus into the sodium nucleus. Sodium transfers its one valence electron to chlorine, forming positive (Na+) and negative (Cl-) ions that attract.

Correct Answer:

Sodium transfers its one valence electron to chlorine, forming positive (Na+) and negative (Cl-) ions that attract.

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