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Shells' arrangement 
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#1
May1811, 10:04 AM

P: 158

Hi,
Why does the 1st shell only can have 2 electrons in it ? Also what are subshells ? 


#2
May1811, 05:51 PM

Sci Advisor
P: 1,395




#3
May1911, 12:37 PM

P: 158

What is the quantum number ?
and n,I and m ? 


#4
May1911, 01:06 PM

Sci Advisor
P: 1,395

Shells' arrangement



#5
May2111, 12:39 AM

P: 351

To know that, you need to learn quantum mechanics a little bit. Subshells are orbitals, determined by quantum numbers in Schrodinger's equations. n is the principal quantum number that determines the shell. l has something to do with angular momentum, m is the magnetic angular quantum number.
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
May2511, 11:09 PM

P: 158




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