18, 38, & 41

ARGON

• Name: Argon
• Symbol: Ar
• Argon is a gas at room temperature
• Argon has no color

HISTORY OF ARGON

• Discovered by Sir William Ramsay
• Year: 1894
• Location: London, England

Uses of Argon
Argon is often used in fluorescent tubes and low-energy lightbulbs. Also, argon is used to fill in the space between panes in double-glazed windows.
There are no biological roles of argon.

Strontium
Name: strontium
Symbol: Sr
Strontium is a solid at room temperature.
Where freshly cut strontium is a silvery color, it quickly turns yellowish with the formation of the oxide.

HISTORY OF STRONTIUM

• Discovered by Adair Crawford
• Year: 1790
• Location: Scotland

Uses of Strontium
Strontium salts are used to give the red color to fireworks and flares. Strontium is also used in the creation of glow-in-the-dark paints and plastics. Strontium chloride hexahydrate is used in toothpaste for sensitive teeth.

NIOBIUM

• Name: niobium
• Symbol: Nb
• Niobium is a solid at room temperature
• Niobium is a grey metallic color

HISTORY OF NIOBIUM

• Discovered by Charles Hatchett
• Year 1801
• Location: England

Uses of Niobium
Niobium is used in alloys such as stainless steel. It is also used in superconducting magnets for particle accelerators, MRI scanners, and NMR equipment.