Which of the following elements has a ground state electronic configuration with an incomplete penultimate shell?

Zoe_ViVi

1 year ago

To determine which element has a ground state electronic configuration with an incomplete penultimate shell, the electronic configuration of the elements must be examined.

Firstly, we can identify the atomic numbers
The atomic numbers are: Iron (Fe) = 26, Sodium (Na) = 11, Aluminium (Al) = 13, Calcium (Ca) = 20.

Then, determine the electron configuration for each element
- Iron (Fe): 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s² (incomplete penultimate shell, as the 3d subshell is not fully occupied)
- Sodium (Na): 1s² 2s² 2p⁶ 3s¹ (no incomplete penultimate shell)
- Aluminium (Al): 1s² 2s² 2p⁶ 3s² 3p¹ (no incomplete penultimate shell)
- Calcium (Ca): 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² (no incomplete penultimate shell)

Lastly, compare the electron configurations
Iron (Fe) has an incomplete penultimate shell due to the partially filled 3d subshell.

The correct answer is:
A. Iron

Smartdaddy69

2 years ago

someon explain