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Worksheet: Electron Configurations

Q1:

Determine the electron configuration of a helium atom by listing the occupancy of the electron shells, in order of increasing energy.

Q2:

An atom has 6 electrons: 2 in the first electron shell and 4 in the second electron shell. It is excited, and one electron moves from the second electron shell to the third electron shell. What is the electronic configuration of the atom?

  • A1, 3, 2
  • B2, 4
  • C2, 4, 1
  • D2, 3, 1
  • E1, 3, 1

Q3:

How many electrons are in the outermost energy shell for promethium (element 61)?

Q4:

Determine the electron configuration of an aluminum atom by listing the occupancy of the electron shells, in order of increasing energy.

  • A2, 4, 7
  • B2, 6, 5
  • C13
  • D2, 8, 3
  • E8, 3

Q5:

Determine the electron configuration of a carbon atom by listing the occupancy of the electron shells, in order of increasing energy.

  • A4, 2
  • B6
  • C3, 3
  • D2, 4
  • E4

Q6:

The 4th ionization energy of aluminum is approximately 154 eV. From which orbital is the electron being removed?

  • A3p
  • B2s
  • C3s
  • D2p

Q7:

An atom has 2 electrons in the first electron shell and 3 electrons in the second electron shell. How is this expressed in electronic configuration notation?

  • A3, 2
  • B5
  • C 1 2 2 3
  • D2, 3
  • E1: 2, 2: 3