The Periodic Table and Energy-Level Models

What element is this?

• Helium
• Hydrogen
• Argon
• Silver

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How many total electrons does Si contain? (click to see image)

• 14
• 28
• 4
• 0

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How many total electrons does an ion of potassium K⁺ contain? (click to see image)

• 18

• 20

• 18

• 40

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What element is represented in this Bohr Model? 

• Carbon
• Hydrogen
• Aluminum
• Lithium

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What are valence electrons?

• electrons in the second energy level
• electrons in the outermost energy level
• all electrons
• electrons in the first level

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How many valence electrons are in Phosphorus?

• 15
• 4
• 5
• 31

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How many electrons are in the outer shell of Sodium (Na)?

• 3
• 1
• 2
• 4

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What element?

• Boron
• Carbon
• Nitrogen
• Lithium

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NGSS.HS-PS1-2

What element?

• Lithium
• Boron
• Carbon
• Neon

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What element?

• Beryllium
• Boron
• Barium
• Bromine

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