Electronic Structure (Ps 25)

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| By Comerchemistry

Comerchemistry

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Quizzes Created: 4 | Total Attempts: 2,201

Questions: 5 | Attempts: 337 | Updated: Mar 20, 2023

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Questions and Answers

1.

Which of the following elements has the greatest number of p electrons?
- A.
  
  C
- B.
  
  Si
- C.
  
  Fe
- D.
  
  Cl
- E.
  
  As
Correct Answer
E. As

Explanation
As (arsenic) has the greatest number of p electrons among the given elements. The electron configuration of As is [Ar] 3d10 4s2 4p3, which means it has 5 p electrons. In comparison, C (carbon) has 2 p electrons, Si (silicon) has 3 p electrons, Fe (iron) has 0 p electrons, and Cl (chlorine) has 3 p electrons. Therefore, As has the greatest number of p electrons.

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2.

Which electron configuration corresponds to that of a noble gas?
- A.
- B.
- C.
- D.
- E.
Correct Answer
C.

Explanation
The electron configuration of a noble gas corresponds to a completely filled outer electron shell. This means that the outermost energy level of the atom is filled with the maximum number of electrons it can hold. Noble gases are known for their stability and lack of reactivity due to this electron configuration. Therefore, the correct answer would be the electron configuration that represents a completely filled outer shell.

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3.

Which of the following elements has an electron configuration that does NOT follow the Aufbau principle?
- A.
  
  Fe
- B.
  
  Mg
- C.
  
  Al
- D.
  
  Ag
- E.
  
  Ni
Correct Answer
D. Ag

Explanation
Ag (Silver) has an electron configuration that does NOT follow the Aufbau principle. The Aufbau principle states that electrons fill the lowest energy levels first before moving to higher energy levels. However, in the case of Ag, the electron configuration is [Kr] 4d^10 5s^1, which suggests that one electron from the 4d orbital has moved to the 5s orbital. This violates the Aufbau principle as the 4d orbital should be filled before moving to the 5s orbital.

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4.

Which of the following is an impossible set of quantum numbers?
- A.
  
  2, 0, 0, 1/2
- B.
  
  2, 1, -1, -1/2
- C.
  
  3, 1, -1, +1/2
- D.
  
  1, 1, 1, -1/2
- E.
  
  3, 2, 1, 1/2
Correct Answer
D. 1, 1, 1, -1/2
5.

Which element has a valence electron configuration of ?
- A.
  
  Li
- B.
  
  Na
- C.
  
  K
- D.
  
  Rb
- E.
  
  Cs
Correct Answer
C. K

Explanation
The element with a valence electron configuration of [Ar] 4s1 is K (potassium). This means that potassium has one valence electron in its outermost energy level.

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Current Version
Mar 20, 2023

Quiz Edited by
ProProfs Editorial Team
Mar 13, 2012

Quiz Created by
Comerchemistry

Electronic Structure (Ps 25)

Which of the following elements has the greatest number of p electrons?

Which electron configuration corresponds to that of a noble gas?

Which of the following elements has an electron configuration that does NOT follow the Aufbau principle?

Which of the following is an impossible set of quantum numbers?

Which element has a valence electron configuration of ?