- #1

- 171

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Hi,

Why does the 1st shell only can have 2 electrons in it ?

Also what are sub-shells ?

Why does the 1st shell only can have 2 electrons in it ?

Also what are sub-shells ?

- Thread starter Jadaav
- Start date

- #1

- 171

- 1

Hi,

Why does the 1st shell only can have 2 electrons in it ?

Also what are sub-shells ?

Why does the 1st shell only can have 2 electrons in it ?

Also what are sub-shells ?

- #2

SpectraCat

Science Advisor

- 1,395

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The Pauli exclusion principle says electrons in atoms cannot share the same 4 quantum numbers. The fact that the electrons are in the 1st shell determines 3 of them (n=1, l=0, mHi,

Why does the 1st shell only can have 2 electrons in it ?

Well, for principal quantum numbers higher than n=1, there are multiple possibilities for the value of the angular momentum quantum number l (l=0 up to l=n-1). Each possible value of l is associated with a sub-shell: l=0 is called the s-subshell, l=1 is called the p-subshell, and so on.Also what are sub-shells ?

- #3

- 171

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What is the quantum number ?

and n,I and m ?

and n,I and m ?

- #4

SpectraCat

Science Advisor

- 1,395

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The quantum number is something you should already know about if you are asking the question in your original post . Seriously though, please look that up on wikipedia to get the basics down, then come back here and ask specific questions if you are confused.What is the quantum number ?

and n,I and m ?

- #5

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In general, l must be less than n, while m must be equal to or less than l. In the first shell n=1 as it is the first shell, l only =0. In the second shell where n=2, l=0 or 1, so m=+1 or -1 or 0. For each set of parameters there is one orbital and in one orbital there are two electrons. Thus in first shell there is only on orbital possible, thus 2 electrons.

I hope this would help you with your question.

- #6

- 171

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OK, thanks I'm going to learn quantum mechanics first.

In general, l must be less than n, while m must be equal to or less than l. In the first shell n=1 as it is the first shell, l only =0. In the second shell where n=2, l=0 or 1, so m=+1 or -1 or 0. For each set of parameters there is one orbital and in one orbital there are two electrons. Thus in first shell there is only on orbital possible, thus 2 electrons.

I hope this would help you with your question.

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