Variable Valency & Covalency in Chemistry


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question 1 of 3

Assign valences to the elements in the carbon dioxide molecule, CO2.

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1. Determine the covalences of P in the molecules PF3 and PCl5.

2. How many electrons are most likely transferred to or from Ca when it forms an ion? That is, what is the most likely valence?

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About This Quiz & Worksheet

These questions will help you find out what you know about valency and covalency. You will be asked to identify different valence states and their implications for a molecule.

Quiz & Worksheet Goals

In this quiz/worksheet combo you'll test your understanding of:

  • Electron gain and loss during ion formation
  • Determining covalences of molecules
  • Assigning valences to a given molecule

Skills Practiced

  • Critical thinking - apply relevant concepts to examine information about valency and covalency in a different light
  • Problem solving - use acquired knowledge to solve valence and covalence practice problems
  • Knowledge application - use your knowledge to answer questions about identifying the formula of a given molecule based on its valence states

Additional Learning

If you would like to know more about this aspect of chemistry, read the lesson titled Variable Valency & Covalency in Chemistry. It teaches you about:

  • The common arrangements molecules take
  • Main group elements
  • Examples of chemical formulas