1. determiner, dans leur etat fondamental, la formule electronique des atomes de:

a. béryllium Be (Z=4)
b.néon Ne (Z=10)
c. sodium Na (Z=11)

2. en déduire leur nombre d'electrons externes et les ions stables qu'ils peuvent donner.

By: USER4429
27 Agustus 2025 physique-chimie 5 minutes
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267 views 267 comments 15 shares

Question

Grade: Education Subject: physique-chimie
1. determiner, dans leur etat fondamental, la formule electronique des atomes de:

a. béryllium Be (Z=4)
b.néon Ne (Z=10)
c. sodium Na (Z=11)

2. en déduire leur nombre d'electrons externes et les ions stables qu'ils peuvent donner.
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Answer (267)

Best Answer
(169)
A. Be= K2 L2
B. Ne= K2 L8
C. Na= K2 L2 M1

Leurs nombres d'electrons externes sont: a. 2
b. 8 et c. 1 leurs ions stables sont: Be+ , Ne2+ , Na-
Answered on 27 Agustus 2025

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