Question:
Among the following, the molecule in which all atoms obey the octet rule is
Among the following, the molecule in which all atoms obey the octet rule is
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Atoms follow the octet rule by completing 8 valence electrons, except for elements like Boron (incomplete octet) and Sulfur (expanded octet).
Updated On: May 5, 2026
- \(BCl_3\)
- \(BeH_2\)
- \(SF_6\)
- \(SCl_2\)
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The Correct Option is D
Solution and Explanation
The octet rule refers to the tendency of atoms to prefer having eight electrons in their valence shell. This rule is applicable mainly to the main-group elements. Let's analyze each of the given molecules to determine which one adheres to this rule.
-
\(BCl_3\):
- Boron has 3 valence electrons and each chlorine atom contributes 1 electron, making a total of 6 electrons around the boron atom.
- Hence, boron does not fulfill the octet rule. It holds only 6 electrons in its outer shell.
-
\(BeH_2\):
- Beryllium has 2 valence electrons and each hydrogen contributes 1 electron, summing up to 4 electrons around the beryllium atom.
- Beryllium does not adhere to the octet rule since it holds only 4 electrons in its valence shell in this molecule.
-
\(SF_6\):
- Sulfur has 6 valence electrons, and each of the six fluorine atoms contributes 1 electron. Thus, there are 12 electrons around the sulfur atom.
- Sulfur in \(SF_6\) expands beyond the octet rule utilizing d-orbitals. Therefore, it is not restricted to the octet rule.
-
\(SCl_2\):
- Sulfur has 6 valence electrons, and each chlorine atom contributes 1 electron, completing the octet with 8 electrons around the sulfur atom.
- Therefore, the \(SCl_2\) molecule fulfills the octet rule for the sulfur atom.
From the analysis above, in the molecule \(SCl_2\), all atoms obey the octet rule, making it the correct answer.
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