Unit 3 Review: Electron Configuration, Periodic Trends

What atom matches this electron configuration?
1s² 2s² 2p⁶ 3s²

• Neon
• Magnesium
• Aluminum
• Potassium

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Which is the electron configuration for an oxygen atom?

• 1s²2s²2p⁶3s²3p⁶4s²
• 1s²2s²2p⁴
• 1s²2s²2p⁶
• 1s²2s²2p⁶3s²3p⁶

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What is the maximum number of electrons that an orbital can hold?

• 1 electron

• 2 electrons

• 3 electrons

• 4 electrons

How many orbitals are there in a d sublevel?

• 1

• 3

• 5

• 7

How many orbitals are there in a p sublevel?

• 2

• 1

• 4

• 3

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How many electrons can the d sublevel hold?

• 8
• 10
• 2
• 4

What is this element? 
1s²2s²2p⁶3s²3p⁶
4s²3d¹⁰4p⁶

• Argon
• Krypton
• Selenium
• Bromide

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What atom matches this electron configuration?
[Xe] 6s² 4f¹⁴ 5d⁹

• Mercury
• Gold
• Platinum
• Thallium

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What is the shorthand electron configuration for Sulfur?

• [Ar] 3p⁴

• [He] 3s²3p⁴

• [Ne] 3s²3p⁴

• [Na] 3s²3p³

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How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0