Moderators: Chem_Mod, Chem_Admin

Posts: 91
Joined: Fri Sep 28, 2018 12:16 am


Postby madisondesilva1c » Mon Oct 22, 2018 12:50 pm

When an electron transitions from n=4 to n=2, or from any higher level to a lower level, should the change in energy by negative always?

Fanny Lee 2K
Posts: 73
Joined: Fri Sep 28, 2018 12:29 am

Re: Transitions

Postby Fanny Lee 2K » Mon Oct 22, 2018 12:53 pm

The electron absorbs energy and moves to a higher energy level. It then produces a line emission spectrum when it moves back down to a lower energy level (goes from an excited state to the ground state) and releases energy. The energy released is negative and should equal to the amount of energy put in because energy is conserved.

Samantha Chang 2K
Posts: 69
Joined: Fri Sep 28, 2018 12:17 am

Re: Transitions

Postby Samantha Chang 2K » Mon Oct 22, 2018 1:09 pm

The change in energy can be negative(exothermic) or positive(endothermic). In this case the change of energy is exothermic in which energy is released, so the value will be negative.

Posts: 18889
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 716 times

Re: Transitions

Postby Chem_Mod » Mon Oct 22, 2018 3:09 pm

The change in energy of the electron is negative because the electron is moving from an excited state back down to its ground state. However, the energy released by the electron is equal to the energy of the photon. Therefore, the change in electron energy is negative while the change in the emitted photon's energy is positive.

Return to “Properties of Electrons”

Who is online

Users browsing this forum: No registered users and 1 guest