ELEMENTS

PHYSICAL PROPERTIES

• Rubidium
• Rb
• Solid at room temp.
• Soft and silvery-white

HISTORY

• Robert Bunsen & Gustav Kirchoff
• 1861
• Found in the mineral lepidolite

USES

• Used in atomic clocks
• Used as a getter in vacuum tubes

PHYSICAL PROPERTIES

• Iodine
• I
• Solid
• Dark pink or purple in color

HISTORY

• Discovered by French chemist Bernard Courtois
• 1811
• Hes found it in seaweed ash

USES

• Used for nutrition and medicine
• Also used to treat external wounds

PHYSICAL PROPERTIES

• Samarium
• Sm
• Solid
• Silver

HISTORY

• Discovered by French chemist Paul Émile Lecoq de Boisbaudran
• 1879
• Can be found in many minerals

USES

• Provides carbon-arc lighting for the motion picture industry
• Used to absorb infared