【 】 1s2 2s2 2p6 3s1 ||What is 1s2 2s2 2p6 3s1 ?||What element has the electron configuration of 1s2 2s2 2p6 3s1 ?

     What is 1s2 2s2 2p6 3s1  ?

1s2 2s2 2p6 3s1  means that 

●s subshell of first orbit or energy level has two electrons,

●s subshell of second orbit or energy level has two electrons,  

●p subshell of second orbit or energy level has six electrons,

●s subshell of third orbit or energy level has one electron.

From 1s2 2s2 2p6 3s1 

electron configuration,we get 2+2+6+1  = 11 electrons.


We know that electron's number is equal to proton number or atomic number for neutral atom.

Since here there is no words about charge,we can say that 1s2 2s2 2p6 3s1  indicates the element whose atomic number is 11.


Now if you look at the periodic table,Mg  (Sodium) has atomic number 11.

So 1s2 2s2 2p6 3s1  is the electron configuration of Na  (Sodium) .

 

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