Optical Spectra of Helium & Other Elements

Click For Summary

Discussion Overview

The discussion revolves around identifying which elements have optical spectra similar to helium, particularly in the context of a homework problem. Participants explore the characteristics of elements like Cadmium, Lithium, Technetium, Titanium, Platinum, Strontium, Calcium, and Francium in relation to helium's electron configuration and spectral properties.

Discussion Character

  • Homework-related, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests that elements with completely filled highest orbitals, like Strontium and Calcium, should have similar spectra to helium, but acknowledges this approach may be incorrect.
  • Another participant proposes Lithium as a candidate due to it having one more electron than helium, though they express uncertainty regarding spectra issues.
  • A different participant expresses dissatisfaction with the question, suggesting that the focus should be on s2 atoms with filled orbitals, but doubts this method will hold when comparing actual spectra.
  • One participant contemplates including 1s atoms with filled orbitals in their considerations, expressing hesitation about their choices due to limited attempts remaining on the assignment.
  • A participant humorously notes that s1 configurations might resemble hydrogen more closely.

Areas of Agreement / Disagreement

Participants do not reach a consensus on which elements should be selected, with multiple competing views and uncertainty regarding the criteria for similarity to helium's optical spectra.

Contextual Notes

Participants express uncertainty about the validity of their approaches and the implications of electron configurations on spectral similarities, indicating potential limitations in their reasoning.

w3390
Messages
341
Reaction score
0

Homework Statement



The following elements should have optical spectra similar to either a hydrogen atom or a helium atom. Indicate which of the following elements should have optical spectra similar to a helium atom. (Select all that apply.)

The choices are: Cadmium, Lithium, Technetium, Titanium, Platinum, Strontium, Calcium, and Francium.

Homework Equations



N/A

The Attempt at a Solution



I thought that since helium has a full level of valence electrons, it would have similar optical spectra as other elements with their highest orbitals completely filled. So I went with Strontium and Calcium, but this is incorrect. What am I doing wrong? Any help would be much appreciated.
 
Physics news on Phys.org
I'd say lithium because it has only one more electron than helium, but I'm not too sure about spectra problems.
 
I don't like the question. My guess would be to go for s2 atoms with all other orbitals filled.

Somehow I don't think this approach will survive when comparing real spectra.

--
methods
 
Ya, that's what I thought too, so I chose Strontium and Calcium but I am wrong. Do you think I should include 1s atoms as well that have all other orbitals filled? I haven't yet tried the combination: Lithium, Calcium, Strontium, and Francium. This may be it, but I am hesitant because I only have one chance left on my assignment.
 
s1 sounds more hydrogenish :wink:

--
 

Similar threads

  • · Replies 14 ·
Replies
14
Views
2K
Replies
7
Views
13K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 7 ·
Replies
7
Views
4K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 19 ·
Replies
19
Views
5K
  • · Replies 4 ·
Replies
4
Views
3K
Replies
1
Views
3K