Radium Radon Uranium Rhenium
Sulphur Selenium Samarium Silver
Tin Argon Silver Gold
Sulphur Silver Selenium Silicon
Strontium Sulphur Scandium Silicon
Nickel Sodium Silver Neptunium
Strontium Scandium Selenium Samarium
Ruthenium Rubidium Rhodium Radium
Scandium Silver Silicon Sodium
Rubidium Rhenum Rhodium Ruthenium