He

(a)  

Li

(a)  

C

(a)  

B

(a)  

N

(a)  

O

(a)  

F

(a)  

Na

(a)  

Mg


(a)  

Al

(a)  

Si

(a)  

P


(a)  

S


(a)  

Cl

(a)  

K

(a)  

Ca


(a)  

Ti

(a)  

V

(a)  

Cr

(a)  

Mn

(a)  

Fe

(a)  

Co

(a)  

Ni

(a)  

Cu

(a)  

Zn

(a)  

Br

(a)  

Au

(a)  

Ag

(a)  

Hg

(a)  

Pb

(a)  

I


(a)  

Ra

(a)  

Pt

(a)