ClO3- Lewis Structure - Chlorate Ion | Summary and Q&A

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July 11, 2020
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ClO3- Lewis Structure - Chlorate Ion

TL;DR

Learn how to draw the Lewis structure of the chlorate ion and understand its stability.

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Questions & Answers

Q: How many valence electrons are there in the chlorate ion?

The chlorate ion has a total of 26 valence electrons: 7 from chlorine and 6 from each of the 3 oxygen atoms.

Q: What determines the number of lone pairs on the central chlorine atom?

The number of lone pairs on the central chlorine atom is determined by finding the highest multiple of 8 below the total valence electrons (26 in this case), which is 24. Subtracting 24 from 26 gives 2, indicating 2 electrons or 1 lone pair.

Q: Is chlorine required to follow the octet rule?

No, chlorine is an element in the third row of the periodic table, allowing it to have more than 8 electrons in its outer shell. It does not have to obey the octet rule.

Q: How can we determine the most stable Lewis structure for the chlorate ion?

To determine the most stable Lewis structure, minimize the formal charge on the central chlorine atom by distributing the electrons and bonds around it. The formal charge should ideally be zero or close to it.

Summary & Key Takeaways

  • The chlorate ion (ClO3-) has 26 valence electrons, with chlorine contributing 7 and oxygen contributing 6 each (multiplied by 3).

  • The central chlorine atom in the chlorate ion has 1 lone pair of electrons.

  • Chlorine, being in the third row of the periodic table, can have an expanded octet and does not have to follow the octet rule.

  • To determine the most stable Lewis structure, the formal charge on the central element should be minimized.

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