Question:
In which one of the following compounds, there is complete octet of central atom
In which one of the following compounds, there is complete octet of central atom
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Elements in period 3 and below (like S, P, Cl) can expand their octet, but they can also have a complete octet.
Updated On: Apr 24, 2026
- BF\(_3\)
- BeH\(_2\)
- SCl\(_2\)
- AlCl\(_3\)
- LiCl
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
The octet rule states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas.
Step 2: Detailed Explanation:
Check the central atom in each compound:
• BF\(_3\): Boron has only 6 electrons in its valence shell (incomplete octet).
• BeH\(_2\): Beryllium has only 4 electrons (incomplete octet).
• SCl\(_2\): Sulfur has 6 valence electrons. It forms two single bonds with two Chlorine atoms, using 2 electrons. The remaining 4 electrons exist as two lone pairs. Total electrons around S = 4 (from bonds) + 4 (from lone pairs) = 8. Complete octet.
• AlCl\(_3\): Aluminum has 6 electrons in its valence shell.
• LiCl: This is an ionic compound, not a covalent molecule with a central atom in the traditional sense.
Step 3: Final Answer:
SCl\(_2\) is the compound where the central atom (S) has a complete octet.
The octet rule states that atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electronic configuration as a noble gas.
Step 2: Detailed Explanation:
Check the central atom in each compound:
• BF\(_3\): Boron has only 6 electrons in its valence shell (incomplete octet).
• BeH\(_2\): Beryllium has only 4 electrons (incomplete octet).
• SCl\(_2\): Sulfur has 6 valence electrons. It forms two single bonds with two Chlorine atoms, using 2 electrons. The remaining 4 electrons exist as two lone pairs. Total electrons around S = 4 (from bonds) + 4 (from lone pairs) = 8. Complete octet.
• AlCl\(_3\): Aluminum has 6 electrons in its valence shell.
• LiCl: This is an ionic compound, not a covalent molecule with a central atom in the traditional sense.
Step 3: Final Answer:
SCl\(_2\) is the compound where the central atom (S) has a complete octet.
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