Quantum Numbers Worksheet #1 Solutions

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Questions and Answers

Which electron configuration is correct for Nickel when it forms a +3 ion?

  • [Ar] 4s2 3d8 (correct)
  • [Ar] 4s1 3d8
  • [Ar] 4s2 3d7
  • [Ar] 4s1 3d9

Which element is an exception to the filling order and has a different electron configuration depending on whether it forms a +1 or +2 ion?

  • Cu (correct)
  • He
  • V
  • Br

What is the correct electron configuration for Copper when it forms a +2 ion?

  • [Ar] 4s1 3d9
  • [Ar] 4s2 3d9
  • [Ar] 4s1 3d10 (correct)
  • [Ar] 4s2 3d8

What is the maximum number of electrons that can occupy an s orbital?

<p>2 (D)</p> Signup and view all the answers

Deduce the maximum number of electrons that can occupy the subshell of f orbitals.

<p>14 (D)</p> Signup and view all the answers

Which element has an electron configuration that ends in 4p5?

<p>Br (D)</p> Signup and view all the answers

What does the principal quantum number 'n' represent?

<p>The energy level the electron is in (C)</p> Signup and view all the answers

For an electron with n = 2, what are the possible values of l?

<p>1, 2 (D)</p> Signup and view all the answers

What is the maximum number of electrons that can be described by n = 4 and l = 2?

<p>14 (B)</p> Signup and view all the answers

Which set of quantum numbers represents a 'p' orbital?

<p>n=3, l=1, ml=0 (A)</p> Signup and view all the answers

How many total orbitals are there when n=5?

<p>25 (C)</p> Signup and view all the answers

Which complete set of quantum numbers represents a valence electron in an atom?

<p>n=4, l=2, ml=0, ms=-1/2 (A)</p> Signup and view all the answers

How many electrons can occupy all of the n=3 orbitals?

<p>2 (A)</p> Signup and view all the answers

What is the maximum number of electrons that can occupy the l=1 shell with n=4?

<p>6 (A)</p> Signup and view all the answers

What are the possible values of ml for an electron in a 3d orbital?

<p>-2, -1, 0, +1, +2 (C)</p> Signup and view all the answers

In which subshell can an electron with n=5 and l=1 be found?

<p>p (B)</p> Signup and view all the answers

What is the value of l for an electron in a 5f orbital?

<p>3 (C)</p> Signup and view all the answers

How many electrons can inhabit all of the n=2 orbitals?

<p>8 (B)</p> Signup and view all the answers

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Study Notes

Electron Configurations

  • Nickel (Ni) in a +3 ion has the electron configuration [Ar] 3d^7.
  • Copper (Cu) in a +2 ion has the electron configuration [Ar] 3d^9.
  • Silver (Ag) is an exception to the filling order, showing different configurations for +1 ([Kr] 4d^10) and +2 ([Kr] 4d^9) ions.

Electron Capacity in Orbitals

  • An s orbital can hold a maximum of 2 electrons.
  • The f subshell can accommodate a maximum of 14 electrons.

Atomic Identification

  • The element with an electron configuration ending in 4p^5 is Bromine (Br).

Quantum Numbers

  • The principal quantum number 'n' indicates the energy level and distance of an electron from the nucleus.
  • For n = 2, the possible values of the azimuthal quantum number (l) are 0 and 1, corresponding to s and p orbitals, respectively.
  • The maximum number of electrons for n = 4 and l = 2 (d orbitals) is 10.

Orbitals and Electrons

  • A 'p' orbital is represented by the quantum numbers where l = 1.
  • At n = 5, there are a total of 25 orbitals: 1s, 3p, 5d, and 7f.
  • A complete set of quantum numbers representing a valence electron typically has n equal to the highest principal quantum number of the atom.

Electron Occupancy

  • All n=3 orbitals can hold a maximum of 18 electrons.
  • The maximum number of electrons that can occupy the l=1 shell with n=4 is 6.
  • Possible values of magnetic quantum number (ml) for an electron in a 3d orbital are -2, -1, 0, +1, +2.
  • An electron with n=5 and l=1 is found in the 5p subshell.
  • The value of l for an electron in a 5f orbital is 3.
  • All n=2 orbitals can accommodate a total of 8 electrons.

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