Helium

(a)  

Lithium

(a)  

Beryllium

(a)  

Boron

(a)  

Carbon

(a)  

Nitrogen

(a)  

Oxygen

(a)  

Fluorine

(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)  

Nickel

(a)  

Copper

(a)  

Zinc

(a)  

Gallium

(a)  

Germanium

(a)  

Arsenic

(a)  

Selenium

(a)  

Bromine

(a)  

Krypton

(a)  

Rubidium

(a)  

Strontium

(a)  

Yttrium

(a)  

Zirconium

(a)  

Niobium

(a)  

Molybdenum

(a)  

Technetium

(a)  

Ruthenium

(a)  

Rhodium

(a)  

Palladium

(a)  

Silver

(a)  

Cadmium

(a)  

Indium

(a)  

Tin

(a)  

Antimony

(a)  

Tellurium

(a)  

Iodine

(a)  

Xenon

(a)  

Cesium

(a)  

Barium

(a)  

Lanthanum

(a)  

Cerium

(a)  

Praseodymium

(a)  

Neodymium

(a)  

Promethium

(a)  

Samarium

(a)  

Europium

(a)  

Gadolinium

(a)  

Terbium

(a)  

Dysprosium

(a)  

Holmium

(a)  

Erbium

(a)  

Thulium

(a)  

Ytterbium

(a)  

Lutetium

(a)  

Hafnium

(a)  

Tantalum

(a)  

Tungsten

(a)  

Rhenium

(a)  

Osmium

(a)  

Iridium

(a)  

Platinum

(a)  

Gold

(a)  

Mercury

(a)  

Thallium

(a)  

Lead

(a)  

Bismuth

(a)  

Polonium

(a)  

Astatine

(a)  

Radon

(a)  

Francium

(a)  

Radium

(a)  

Actinium

(a)  

Thorium

(a)  

Protactinium

(a)  

Uranium

(a)  

Neptunium

(a)  

Plutonium

(a)  

Americium

(a)  

Curium

(a)  

Berkelium

(a)  

Californium

(a)  

Einsteinium

(a)  

Fermium

(a)  

Mendelevium

(a)  

Nobelium

(a)  

Lawrencium

(a)  

Rutherfordium

(a)  

Dubnium

(a)  

Seaborgium

(a)  

Bohrium

(a)  

Hassium

(a)  

Meitnerium

(a)  

Darmstadtium

(a)  

Roentgenium

(a)  

Copernicium

(a)  

Nihonium

(a)  

Flerovium

(a)  

Moscovium

(a)  

Livermorium

(a)  

Tennessine

(a)  

Oganesson

(a)