H
Li
Na
He
K
Rb
Cs
Fr
Be
Mg
Ca
Sr
Ra
Ba
Ne
F
Cl
Br
I
O
S
Se
Te
N
P
As
Sb
C
Si
Ge
Sn
Pb
Po
Bi
At
Ar
Kr
Xe
Rn
B
Al
Ga
In
Tl