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Electron Configurations

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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

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Solution Summary

Electron configurations are investigated. Full explanations are provided.

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See Also This Related BrainMass Solution

Patterns in the Electronic Configurations of the Elements

Describe the patterns in the electronic configurations of the elements.

Each row across the periodic table is called a period and the elements gradually change properties from left to right. Can you explain this in terms of the electronic configurations?

Each column of the periodic table is called a family. Elements in the same family have similar properties. Are there any similarities in the electronic configuration within a family (column)?

Would you expect the size of the atoms to increase, decrease, or stay the same from the top of the column (family) to the bottom of the same column (same family)? Explain.

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