Identify the following element-

Four electrons in the third main energy level.

Question

Identify the following element-
 
Four electrons in the third main energy level.

mayankdevnani · Answer

Silicon...       @amishra

anonymous · Answer

Electron configuration of Si;
$$1s ^{2} 2s ^{2} 2p ^{6} 3s ^{2} 3p ^{2}$$
If you draw an Energy Diagram(for Si) you'll see that the 3rd energy level (3s,3p,4s and 3d) has 4 electrons in total.

anonymous · Answer

I am sorry, I didn't understand. :/

anonymous · Answer

|dw:1347892907941:dw|

This is an energy diagram for Si. 
As you can see the 3rd energy level (n=3) has 2electrons in 3s and 2 electrons in 3p. 
2+2=4 

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anonymous · Answer

Oh thank you! I finally got it!! :D Thank you so much!

anonymous · Answer

you're welcome (: