Electron Configurations

How many valence electrons does Na have?

• 1

• 5

• 6

• 11

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Which complete electron configuration belongs to chlorine (Cl)?

• 1s² 2s² 2p⁶ 3s² 3p⁵
• 1s² 2s² 2p⁶ 3s² 3p⁶
• 1s² 2s² 2p⁶ 3s² 3p⁷

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This orbital diagram represents:  

• C
• B
• N
• O

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NGSS.HS-PS1-1

Which element is this:  1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶

• Argon
• Krypton
• Selenium
• Bromide

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NGSS.HS-PS1-2

Which of the following represents the ground-state electron configuration for the gold (I) ion, Au⁺?

• [Xe]6s²4f¹⁴5d⁹

• [Xe]6s¹4f¹⁴5d⁹

• [Xe]4f¹⁴5d⁹

• [Xe]6s¹5d⁹

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which elements usually form cations?

• non-metals

• metals

• any elements

• noble gases

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element is pictured?

• neon
• fluorine
• magnesium
• argon

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NGSS.HS-PS1-1

1.  What is the shape of an s orbital?

• sphere
• dumbbell
• double dumbbell
• TOO COMPLEX TO KNOW IT.

What element has this electron configuration?

• hydrogen

• helium

• lithium

• beryllium

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NGSS.HS-PS1-1

An aluminium ion would have which electron configuration?

• 1s² 2s² 2p⁶ 3s²

• 1s² 2s² 2p⁶ 3s² 3p¹

• 1s² 2s² 2p⁶ 3s² 3p⁶

• 1s² 2s² 2p⁶

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NGSS.HS-PS1-1

NGSS.HS-PS1-2