Thursday, January 12, 2012

What are the different shells of electrons about an atom?

The electons are arranged in 'energy levels' and 'orbitals'. The formula for how many electrons are in each energy level is represented by 2n^2, where n=the energy level. They are further divided into orbitals (sharp, principle, difuse, fundemental or s,p,d,f).



So...



In the first energy level, there is one s orbital that holds 2 electrons. 2n^2=2 (total electrons, where n=1).



In the second energy level, there is one s orbital and three p orbitals. This makes for 8 total electons on the second energy level. 2n^2=8 (n=2). The s orbital has 1 pair of electrons, the p orbital holds 3 pair. This allows for 10 total electrons before another energy level is needed. The pattern continues.

What are the different shells of electrons about an atom?
s,p,d,f blocks



s block- 1 subshell(0). holds a max of 2 electron

p block- 3 subshells(-1,0,1). hold max of 6 electron

d block- 5 sub shells(-2,-1,0,1,2). hold max of 10 electron

f block- 7 subshell(-3,-2,-1,0,1,2,3). holds max of 14 electron



remember each sub shell can only hold 2 electron (+1/2, -1/2)
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