Electron Configuration and Periodic Table Test Quiz

Which of the following is the correct electron configuration for oxygen (atomic number 8)?

• 1s² 2s² 2p⁴

• 1s² 2s² 2p² 3s²

• 1s² 2s² 2p⁶

• 1s² 2s² 2p³

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In Bohr’s model, what do the concentric circles around the nucleus represent?

• Valence electrons

• Energy levels

• Orbitals

• Atomic mass

What is the maximum number of electrons that can fit in the 3rd energy level?

• 2

• 8

• 18

• 32

An element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p³.
Based on this configuration, what are its group, period, and block in the periodic table?

• Group 5,

  Period 3,

  p-block

• Group 3,

  Period 3,

  p-block

• Group 5,

  Period 2,

  s-block

• Group 6,

  Period 3,

  p-block

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The number of valence electrons in chlorine (atomic number 17) is:

• 5

• 7

• 8

• 17

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Which element has the configuration 1s² 2s² 2p⁶ 3s² 3p⁵?

• Fluorine

• Chlorine

• Argon

• Bromine

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In the periodic table, elements with the same number of valence electrons are arranged:

• In the same period

• In the same group

• In the same block

• By increasing atomic mass

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Look at the diagram of a Bohr model with 11 protons and three energy levels, where the outer shell has 1 electron. Which element is represented?

• Sodium

• Magnesium

• Lithium

• Potassium

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A Bohr model diagram shows 2 electrons in the first shell and 6 electrons in the second shell. Which element is this?

• Oxygen

• Carbon

• Nitrogen

• Neon

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Which of the following explains why calcium (atomic number 20) is placed in Group 2?

• It has 2 energy levels

• It has 2 valence electrons

• It has 2 protons in its nucleus

• It is the 2nd element in period 4

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