electron configurations

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kpang_4H
Posts: 55
Joined: Fri Sep 20, 2019 12:17 am

electron configurations

Postby kpang_4H » Wed Oct 23, 2019 4:34 pm

How can you tell if an atom is in its ground state or an excited state by looking at its electron configuration? For example, Li: [Ar] 1s^2 2p^1

WesleyWu_1C
Posts: 117
Joined: Thu Jul 25, 2019 12:16 am

Re: electron configurations

Postby WesleyWu_1C » Wed Oct 23, 2019 4:43 pm

The electron configuration in the periodic table is when the atom is in its ground state, which means that any other electronic configuration of that atom would be its excited state. So the ground state of Li is [Ar] 1s^2 2s^1, which means the example you gave in your post would be in the excited state.

Leyna Dang 2H
Posts: 104
Joined: Thu Jul 25, 2019 12:17 am

Re: electron configurations

Postby Leyna Dang 2H » Wed Oct 23, 2019 4:49 pm

I think you meant [He] haha but anyways, I think one thing you could do is count up the number of electrons in the given configuration and compare the total to the element on the periodic table that has the total as its atomic number. If the elements match, then the configuration is in the grounded state. If it's different, it's most likely in its ground state.


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