12
H   12.00  1.0079
He  11.00  4.0026
C    8.14  12.011
N    7.90  14.007
O    8.48  15.999
Na   5.36  22.990
Mg   6.03  24.305
Si   6.24  28.086
S    7.45  32.066
Cl   5.27  35.453
Ar   6.08  39.948
Fe   5.24  55.845