5.2 electronic configuration of atom

The electron configuration of an atom is 1s²2s²2p⁶.  The number of electrons in the atom is 

• 3
• 6
• 8
• 10

An orbital can at most hold how many electrons?

• 1 electron
• 2 electrons
• 3 electrons
• 4 electrons

The electron configuration of an atom is 1s²2s²2p⁶.  The number of valence electrons in the atom is 

• 3
• 6
• 8
• 10

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What electron configuration matches an oxygen ion? (Z=8)

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵

• 1s²2s²2p⁴

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s²3p⁶4s²3d¹

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Write the electronic configuration for sodium Na (Z=11)

• 1s² 2s² 2p⁶

• 1s² 2s² 2p⁶ 3s²

• 1s² 2s² 2p⁶ 3s¹

• 1s² 2s² 2p⁶ 3s² 3p⁴

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State the valence electronic configuration for Mg (Z=12)

• 3s²

• 3s² 3p¹

• 3s² 3p³

• 3s² 3p⁴

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Determine the element that has valence electron 3s^23p¹

(Z of Na = 11, Al = 13, Cl = 17, Mg = 12)

• Na

• Al

• Cl

• Mg

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Electron must be arrange from lowest energy to highest energy.

State the rule/principle?

• Hund's Rule

• Pauli Exclusion Principle

• Aufbau Principle

• Zuhaizi Principle

Which element is pictured?

• neon (Z=10)

• fluorine (Z=9)

• magnesium (Z=12)

• argon (Z=18)

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All ions matches with this electronic configuration.Except?

1s²2s²2p⁶3s²3p⁶

• Al³⁺

• Cl^-

• S^2-

• Ca²⁺

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