Tabla de Valencias

1 - H (1, -1)     4-Be(2)        5-B(3)          6-C(2,4)           7-N(1,3,5)           8-O(2)                9-F(1)                     2-He
3 - Li (1)        12-Mg(2)       13-Al(3)       14-Si(2,4)        15-P(1,3,5)          16-S(2,4,6)        17-Cl(1,3,5,7)          10-Ne
11 - Na (1)     20-Ca(2)        31-Ga(3)     32-Ge(2,4)       33-As(1,3,5)        34-Se(2,4,6)       35-Br(1,3,5,7)          18-Ar 
19 - K (1)       38-Sr(2)        49-In(3)       50-Sn(2,4)       51-Sb(1,3,5)        52-Te(2,4,6)        53-I(1,3,5,7)            36-Kr   
37 - Rb (1)     56-Ba(2)       81-Tl(3)        82-Pb(2,4)      83-Bi(1,3,5)         84-Po(2,4)          85-At(1,2,3,5,7)       54-Xe
55 - Cs (1)      88-Ra(2)                                                                                                                               86-Rn
87 - Fr (1)