Cevaplar

2012-11-17T23:31:51+02:00

1s 2s2p 3s3p3d 

2+2+6+2+6+3=21

0
2012-11-17T23:32:29+02:00

1s 2s2p 3s3p3d 

2+2+6+2+6+3=21

   
0