Hydrogen

(a)  

Helium

(a)  

Silicon

(a)  

P

(a)  

Potassium

(a)  

Calcium

(a)  

Mg

(a)  

Sodium

(a)  

Beryllium

(a)  

Li

(a)  

N

(a)  

Fluorine

(a)  

B

(a)  

Neon

(a)  

S

(a)  

Chlorine

(a)  

Argon

(a)  

Aluminum

(a)  

Oxygen

(a)