Elements that have no isotopes

A few of the elements have no naturally occurring isotopes (or at least so little that any others are of no importance). These are: 

• Beryllium-9 
• Fluorine-19 
• Sodium-23 
• Aluminum-27 
• Phosphorus-31 
• Scandium-45 
• Manganese-55 
• Cobalt-59 
• Arsenic-75 
• Yttrium-89 
• Niobium-93 
• Rhodium103 
• Iodine-127 
• Cesium-133 
• Praseodymium-141 
• Terbium-159 
• Holmium-165 
• Thulium-169 
• Gold-197 
• Bismuth-209 

Tin has the distinction of having more naturally occurring isotopes - ten - than any other atom. Xenon is not far behind at nine. 

Copyright © 1996 David Dice