Click Pause. Elements can be classified as metals and nonmetals. Metals do not hold on to their valence electrons very tightly, while nonmetals hold their electrons tightly. Ionization energy is a measure of how tightly the valence electrons are held. Try pulling an electron away from each atom. Based on this experiment, which atom is a metal?

Click Pause. Elements can be classified as metals and nonmetals. Metals do not hold on to their valence electrons very tightly, while nonmetals hold their electrons tightly. Ionization energy is a measure of how tightly the valence electrons are held. Try pulling an electron away from each atom. Based on this experiment, which atom is a nonmetal?

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Introduction: Some of the particles that make up atoms have an electrical charge. Electrons are negatively charged, while protons are positively charged. Particles with opposite charges (+ and –) attract, while particles with the same charge (+ and + or – and –) repel.

Like charges do what?

Get the Gizmo ready: 

• Click Reset.

Check that sodium and chlorine are still selected.

Introduction: Some of the particles that make up atoms have an electrical charge. Electrons are negatively charged, while protons are positively charged. Particles with opposite charges (+ and –) attract, while particles with the same charge (+ and + or – and –) repel.

Opposite charges do what?