10. Periodic Properties of the Elements

The Electron Configuration: Quantum Numbers

10. Periodic Properties of the Elements

# The Electron Configuration: Quantum Numbers - Video Tutorials & Practice Problems

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The **Quantum Numbers** ultimately can be used to determine the precise location of an electron.

Electron Configuration & Quantum Numbers

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## The Electron Configuration: Quantum Numbers

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## The Electron Configuration: Quantum Numbers Example 1

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## The Electron Configuration: Quantum Numbers

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## The Electron Configuration: Quantum Numbers Example 2

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Problem

ProblemGive the set of four quantum numbers that represent the indicated electron in each of the following elements.

Mg (7th electron)

A

n = 2; l = 2; ml = 0; ms = +1/2

B

n = 2; l = 1; ml = 0; ms = -1/2

C

n = 2; l = 1; ml = +1; ms = +1/2

D

n = 2; l = 1; ml = +1; ms = -1/2

E

n = 2; l = 1; ml = -1; ms = +1/2

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Problem

ProblemGive the set of four quantum numbers that represent the indicated electron in each of the following elements.

Cl^{–} (18th electron)

A

n = 3; l = 0; ml = +1; ms = -1/2

B

n = 3; l = 0; ml = -1; ms = -1/2

C

n = 3; l = 2; ml = +1; ms = -1/2

D

n = 3; l = 1; ml = +1; ms = +1/2

E

n = 3; l = 1; ml = +1; ms = -1/2

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Problem

ProblemGive the set of four quantum numbers that represent the indicated electron in each of the following elements.

Cr^{3+} (21^{st }electron)

A

n = 3; l = 1; ml = 0; ms = -1/2

B

n = 3; l = 2; ml = 1; ms = -1/2

C

n = 3; l = 1; ml = 1; ms = +1/2

D

n = 3; l = 2; ml = 0; ms = +1/2

E

n = 3; l = 1; ml = 0; ms = +1/2

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PRACTICE PROBLEMS AND ACTIVITIES (14)

- Use the periodic table to determine each quantity. a. the number of 2s electrons in Li
- Use the periodic table to determine each quantity. c. the number of 4p electrons in Br
- Use the periodic table to determine each quantity. b. the number of 3d electrons in Cu
- Use the periodic table to determine each quantity. a. the number of 3s electrons in Mg b. the number of 3d ele...
- Assign a set of four quantum numbers for the outermost two electrons in Sr.
- Why does the number of elements in successive periods of the periodic table increase by the progression 2, 8, ...
- Iron is commonly found as Fe, Fe2+, and Fe3+. (b) What are the n and l quantum numbers of the electron removed...
- You have cracked a secret code that uses elemental symbols to spell words. The code uses numbers to designate ...
- (f) Can contain two electrons, both with spin ms = +1/2
- (b) Can have ml = -1
- Given the subshells 1s, 2s, 2p, 3s, 3p and 3d, identify those that meet the following descriptions. (a) Has l ...
- (c) Draw an orbital-filling diagram for the element with atomic number 12.
- Assume that the rules for quantum numbers are different and that the spin quantum number ms can have any of th...
- In what way are the electron configurations of H, Li, Na, K, Rb, and Cs similar?