AP Chemistry Question 431: Answer and Explanation

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Question: 431

9. The photoelectron data for sodium are shown below.

Photoelectron Spectroscopy Data Table for Sodium

Binding Energy (MJ)Relative Number of Electrons
0.501
3.676
6.842
1042

Which of the following statements is not true about this data?

  • A. All 11 electrons are shown in the table.
  • B. The 3 valence electrons have the lowest energies at 0.50, 3.67, and 6.84 MJ/mol.
  • C. The p electrons are all at the same energy of 3.67 MJ/mol.
  • D. Electrons closest to the nucleus have the lowest energies.

Correct Answer: B

Explanation:

(B) Sodium has only 1 valence electron, not 3.