Helium

(a)  

Lithium

(a)  

Beryllium

(a)  

Boron

(a)  

Carbon

(a)  

Nitrogen

(a)  

Oxygen

(a)  

Florine

(a)  

Neon

(a)  

Sodium

(a)  

Magnesium

(a)  

Aluminum

(a)  

Silicon

(a)  

Phosphorus

(a)  

Sulfur

(a)  

Chlorine

(a)  

Argon

(a)  

Potassium

(a)  

Calcium

(a)  

Scandium

(a)  

Titanium

(a)  

Vanadium

(a)  

Chromium

(a)  

Manganese

(a)  

Iron

(a)  

Cobalt

(a)  

Nickle

(a)  

Copper

(a)  

Zinc

(a)  

Gallium

(a)  

Germanium

(a)  

Arsenic

(a)  

Selenium

(a)  

Bromine

(a)  

Krypton

(a)  

Rubidium

(a)  

Strontium

(a)  

Silver

(a)  

Cadmium

(a)  

Indium

(a)  

Tin

(a)  

Antimony

(a)  

Tellurium

(a)  

Iodine

(a)  

Xenon

(a)  

Cesium

(a)  

Barium

(a)  

Platinum

(a)  

Gold

(a)  

Mercury

(a)  

Lead

(a)  

Polonium

(a)  

Radon

(a)  

Francium

(a)  

Radium

(a)  

Thorium

(a)