Worksheet: Electron Configurations

In this worksheet, we will practice using electron shell notation to identify elements and describe the electron configurations of atoms and ions.

Q1:

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?

  • A1: 2, 2: 3
  • B5
  • C3, 2
  • D 1 2
  • E2, 3

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, 3, 1
  • D1, 3, 1
  • E2, 4, 1

Q3:

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

Q4:

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

  • A2, 6, 5
  • B8, 3
  • C13
  • D2, 4, 7
  • E2, 8, 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
  • B2, 4
  • C6
  • D3, 3
  • E4

Q6:

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

Q7:

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

  • A2p
  • B3p
  • C2s
  • D3s

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