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corrigé DS9 11-12
Devoir surveillé n°9
11
-
12
(MP). 1.
Corrigé
. La colonne 13 (mines ponts mp 2008 ). 1) B : 1s. 2. 2s. 2. 2p. 1. Ga : 1s. 2. 2s. 2. 2p. 6. 3s. 2. 3p. 6. 4s. 2. 3d. 10. 4p. 1.
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