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Electron Configurations

The general electron configuration for atoms of all elements in Group 5A is ________.

ns2np6
ns2np5
ns2np4
ns2np3
ns2np1

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Which element has the following electron configuration?

[Kr]5s24d105p1

Sn
Sb
Cd
Ga
In

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Which element forms stable +2 cations?

Kr
I
Se
Al
Ba

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Which two electron configurations represent elements that would have similar chemical properties?

1s22s22p4
1s22s22p5
[Ar]4s23d104p3
[Ar]4s23d104p4
1, 2
1, 3
1, 4
2, 4
2, 3

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Which of the following is the electron configuration for the Al3+ ion?

1s22s22p63s2
1s22s22p63s23p2
1s22s22p63s23p1
1s22s22p6
1s22s22p63s23p4

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The sulfide ion S2- is isoelectronic with which one of the following?

O2-
F-
Na+
Al3+
K+

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How many 3d electrons does an Fe3+ ion have?

9
6
5
4
3

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Which of the atoms listed below will have the largest radius?

B
Ga
Br
Si
Cl

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Arrange the following ions in order of increasing ionic radius: K+, P3-, S2-, Cl-.

K+, Cl-, S2-, P3-
K+, P3-, S2-, Cl-
P3-, S2-, Cl-, K+
Cl-, S2-, P3-, K+
Cl-, S2-, K+, P3-

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Which element will have the smallest ionization energy?

Li
Na
Be
K
Rb

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Which of the following atoms has the greatest electron affinity (largest positive value)?

S
P
Ga
Li
Br

Solution Summary

Electron configurations are investigated. Full explanations are provided.

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