H-Atom Equation

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304922790
Posts: 25
Joined: Fri Sep 29, 2017 7:04 am

H-Atom Equation

Postby 304922790 » Fri Oct 13, 2017 9:40 pm

Why is there a negative sign in E(N)= -hR/n^2 aka the equation for H-atoms? Does the negative sign mean energy is lost when it goes from a higher state back to ground level? But for problems where the electron goes from ground state to a higher/ excited state (like from n=1 to n=2), do we still use the negative sign in the equation?

Abdullah2I
Posts: 41
Joined: Fri Sep 29, 2017 7:06 am

Re: H-Atom Equation

Postby Abdullah2I » Fri Oct 13, 2017 10:01 pm

Yes, I think you're right about the negative being from energy level going down/electrons being emitted. I'm not sure about the second part though.

Lianna Kishi 1A
Posts: 23
Joined: Thu Jul 27, 2017 3:00 am

Re: H-Atom Equation

Postby Lianna Kishi 1A » Fri Oct 13, 2017 11:55 pm

For your second question: Yes you would still use the negative sign in the equation but when you calculate
the energy would turn out positive.

Rachel Formaker 1E
Posts: 86
Joined: Fri Sep 29, 2017 7:04 am
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Re: H-Atom Equation

Postby Rachel Formaker 1E » Sun Oct 15, 2017 1:20 pm

To elaborate on the last answer:
When you calculate ΔE, you do final-initial.
In this case, that means En (final) - En (initial)
When the electron is moving from a higher energy state to a lower energy state, ΔE will be negative. When the electron is moving from a lower energy state to a higher energy state, ΔE will be positive.


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