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What is the electron configuration of a chlorine ion in a compound of BeCl2?

A. 2.8.7
B. [2.8.8]+
C. [2.8.8]-
D. [2.8.7]-

Respuesta :

C. [2.8.8]- 
Each Cl takes one electron from Be.
The correct electron configuration is: Cl 1s2 2s2 2p6 3s2 3p5.

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