Energy State

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Stephanie Kao 4K
Posts: 4
Joined: Fri Sep 25, 2015 3:00 am

Energy State

Postby Stephanie Kao 4K » Thu Oct 29, 2015 8:35 pm

How do you determine the energy state (ground state or excited state) of an ion given the electron configuration and the number of unpaired electrons?
For example:
Configuration: [Kr]4d105s25p56s1
Number of unpaired electrons: 2
What is the energy state of this ion and why?

Heerali Patel 3A
Posts: 26
Joined: Fri Sep 25, 2015 3:00 am

Re: Energy State

Postby Heerali Patel 3A » Thu Oct 29, 2015 10:34 pm

This electron configuration represents the excited state of an iodine atom. You can tell because the ground state configuration would have a full 5p orbital (6 electrons) and zero unpaired electrons, given this is the lowest energy state possible for iodine. In this case, one valence electron has moved to a higher energy orbital (6s), so it can be seen that the iodine atom is in a higher energy state. This gives it the excited state.

Therefore, in general, you can determine the energy state of an atom by looking at whether the electron configuration represents the lowest possible energy state, meaning whether all the orbitals are filled before electrons enter a higher energy orbital.

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