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Electronic Structure Test Questions

Chemistry Test Questions

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Much of the study of chemistry involves the interactions between different atoms' electrons. It is important, therefore, to understand the arrangement of electrons of an atom. This ten question multiple choice chemistry practice test deals with the concepts of electronic structure, Hund's Rule, quantum numbers and the Bohr atom.

You may wish to review the subject by reading the following articles:

Bohr Model of the Atom
Electron Configurations of the Elements
Angular Momentum Quantum Numbers - Where Does s, p, d, and f Come From?
Quantum Numbers and Electron Orbitals
The Aufbau Principle

Answers to each question appear at the end of the test.

Question 1

The total number of electrons that can occupy the principle energy level n is:

(a) 2
(b) 8
(c) n
(d) 2n2

Question 2

For an electron with angular quantum number ℓ = 2, the magnetic quantum number m can have

(a) an infinite number of values
(b) only one value
(c) one of two possible values
(d) one of three possible values
(e) one of five possible values

Question 3

The total number of electrons allowed in a ℓ = 1 sublevel is

(a) 2 electrons
(b) 6 electrons
(c) 8 electrons
(d) 10 electrons
(e) 14 electrons

Question 4

A 3p electron can have possible magnetic quantum number m values of

(a) 1, 2, and 3
(b) +½ or -½
(c) 0, 1, and 2
(d) -1, 0 and 1
(e) -2, -1, 0, 1 and 2

Question 5

Which of the following set of quantum numbers would represent an electron in a 3d orbital?

(a) 3, 2, 1, -½
(b) 3, 2, 0, +½
(c) either a or b
(d) neither a nor b

Question 6

Calcium has an atomic number of 20. A stable calcium atom has an electronic configuration of

(a) 1s22s22p63s23p64s2
(b) 1s21p61d101f2
(c) 1s22s22p63s23p63d2
(d) 1s22s22p63s23p6
(e) 1s21p62s22p63s23p2

Question 7

Phosphorus has an atomic number of 15. A stable phosphorus atom has an electronic configuration of

(a) 1s21p62s22p5
(b) 1s22s22p63s23p3
(c) 1s22s22p63s23p14s2
(d) 1s21p61d7

Question 8

The electrons with principle energy level n = 2 of a stable atom of boron (atomic number = 5) would have an electron arrangement of

(a) ( ↑ ↓ ) ( ↑   ) (     ) (     )
(b) ( ↑   ) ( ↑   ) ( ↑   ) (     )
(c) (     ) ( ↑   ) ( ↑   ) ( ↑   )
(d) (     ) ( ↑ ↓ ) ( ↑   ) (     )
(e) ( ↑ ↓ ) ( ↑ ↓ ) ( ↑   ) ( ↑   )

Question 9

Which of the following electron arrangements does not represent an atom in its ground state?

      (1s)      (2s)               (2p)              (3s)
(a) ( ↑ ↓ )   ( ↑ ↓ )   ( ↑ ↓ ) ( ↑ ↓ ) ( ↑ ↓ )   ( ↑   )
(b) ( ↑ ↓ )   ( ↑ ↓ )   ( ↑ ↓ ) ( ↑ ↓ ) ( ↑ ↓ )   ( ↑ ↓ )
(c) ( ↑ ↓ )   ( ↑ ↓ )   ( ↑ ↓ ) ( ↑   ) ( ↑   )
(d) ( ↑ ↓ )   ( ↑ ↓ )   ( ↑ ↓ ) ( ↑ ↓ ) (     )

Question 10

Which of the following statements are false?

(a) the greater the energy transition, the greater the frequency
(b) the greater the energy transition, the shorter the wavelength
(c) the higher the frequency, the longer the wavelength
(d) the smaller the energy transition, the longer the wavelength

Answers

1. (d) 2n2
2. (e) one of five possible values
3. (b) 6 electrons
4. (d) -1, 0 and 1
5. (c) either set of quantum numbers would express an electron in a 3d orbital.
6. (a) 1s22s22p63s23p64s2
7. (b) 1s22s22p63s23p3
8. (a) ( ↑ ↓ ) ( ↑   ) (     ) (     )
9. (d) ( ↑ ↓ )   ( ↑ ↓ )   ( ↑ ↓ ) ( ↑ ↓ ) (     )
10. (c) the higher the frequency, the longer the wavelength

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