Valence Electron: Definition, Configuration & Example


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The electron configuration of Kr is [Ar] 3d10 4s2 4p6. How many valence electrons does Kr have?

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1. Cl has a configuration of [Ne] 3s2 3p5. How many valence electrons does Cl have?

2. Except for helium, all noble gases have ______ valence electrons.

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About This Quiz & Worksheet

Valence electrons are important to be acquainted with when learning about chemical reactions, and this quiz/worksheet will help you test your understanding of their place in chemistry.

Quiz & Worksheet Goals

In these assessments you'll be tested on:

  • Valence electrons in certain elements
  • Noble gas configurations
  • Electron configurations

Skills Practiced

This quiz and worksheet allow students to test the following skills:

  • Knowledge application - use your knowledge to answer questions about valence electrons
  • Distinguishing differences - compare and contrast the characteristics of different elements discussed in the lesson
  • Information recall - access the knowledge you've gained regarding noble gas and electron configurations

Additional Learning

To learn more about valence electrons and chemical reactions, review the accompanying lesson titled Valence Electron: Definition, Configuration & Examples. This lesson covers the following objectives:

  • Define valence electrons and know their place in atoms
  • Familiarize yourself with examples of valence electrons
  • Define electron configuration
  • Familiarize yourself with valence electron configuration
  • Define noble gas configuration
  • Familiarize yourself with methods of writing electron configuration