The elements that occur on Earth only in traces are listed below. 
Isotopes of other elements (not exhaustive):
*Tritium
*Beryllium-7
*Beryllium-10
*Carbon-14
*Fluorine-18
*Sodium-22
*Sodium-24
*Magnesium-28
*Silicon-31
*Silicon-32
*Phosphorus-32
*Sulfur-35
*Sulfur-38
*Chlorine-34m
*Chlorine-36
*Chlorine-38
*Chlorine-39
*Argon-39
*Argon-42
*Calcium-41
*Iron-60
*Nickel-59
*Selenium-79
*Krypton-81
*Strontium-90