1)Which of the following ions have noble gas electronconfigurations? (Type your

Question

1)Which of the following ions have noble gas electronconfigurations? (Type your answer using the format [NH4]+ forNH4+ and [Ni(CN)4]2- forNi(CN)42-.) (a) Fe2+,Fe3+, Sc3+, Co3+
(b) Tl+, Te2-,Cr3+
(c) Rb2+, Sr2+,Sn2+
(d) P3-, S3-,Br3- 2) Write electron configurations for each ofthe following. (Type your answer using the format [Ar] 4s2 3d10 4p2for [Ar] 4s2 3d104p2.)
Ca2+
Cs+
Pb2+
S2-
P3-
N3-
6
F-

(a) Fe2+,Fe3+, Sc3+, Co3+
(b) Tl+, Te2-,Cr3+
(c) Rb2+, Sr2+,Sn2+
(d) P3-, S3-,Br3- 2) Write electron configurations for each ofthe following. (Type your answer using the format [Ar] 4s2 3d10 4p2for [Ar] 4s2 3d104p2.)
Ca2+
Cs+
Pb2+
S2-
P3-
N3-
6
F-

2) Write electron configurations for each ofthe following. (Type your answer using the format [Ar] 4s2 3d10 4p2for [Ar] 4s2 3d104p2.)
Ca2+
Cs+
Pb2+
S2-
P3-
N3-
6
F-

Explanation / Answer

~~~~~~ Answers: a. Sc3+ = Ar
b. Te2- = Xe
c. Sr2+ = Kr
d. P3- = Ar

Ca2+   = [Ar]
Cs+   = [Xe]
Pb2+   = [Xe] 6s2 5f14
S2-   = [Ar]
P3-   =   [Ar]
N3-   = [Ne]
F-   = [Ne]

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