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What is the electronic configuration and hybridisation of As in AsF₅?

1. 1s² 2s² 2p⁶ 3s² 3p³ 3d¹, sp³ hybridisation
2. 1s² 2s² 2p⁶ 3s² 3p³ 3d¹, sp³d hybridisation
3. 1s² 2s² 2p⁶ 3s² 3p³ 3d¹, sp³d² hybridisation
4. 1s² 2s² 2p⁶ 3s² 3p³ 3d¹, sp³d³ hybridisation

Correct answer: 1s² 2s² 2p⁶ 3s² 3p³ 3d¹, sp³d hybridisation

Solution

The electronic configuration of As is 1s² 2s² 2p⁶ 3s² 3p³ 3d¹. In AsF₅, As forms five bonds, requiring sp³d hybridisation to accommodate five bonding orbitals.

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