Arsenic (As)

Atomic Number: 33

Relative Atomic Mass: 74.921602

Electronegativity: 2.18

Atomic Radius (Picometers): 115

Appearance: Metallic Grey

Occurrence: Natural

Sublimation Point (Kelvin): 887

Stable Isotopes: 75

Discoverer: Albertus Magnus in 1250

Properties: Brittle, Toxic

First Use: Bronze (2500 BC)

Modern Uses: Alloys, Medicine

Picture Courtesy of Tomihahndorf

©2011 Grant Dwyer

Germanium (Ge)

Atomic Number: 32

Relative Atomic Mass: 72.631

Electronegativity: 2.01

Atomic Radius (Picometers): 125

Appearance: Greyish White

Occurrence: Natural

Melting Point (Kelvin): 1211.40

Boiling Point (Kelvin): 3106

Stable Isotopes: 70, 72, 73, 74

Discoverer: Clemens Winkler in 1886

Properties: Brittle, Hard

First Use: Unknown

Modern Uses: Optics, Electronics

Picture Courtesy of Jurii

©2011 Grant Dwyer

Gallium (Ga)

Atomic Number: 31

Relative Atomic Mass: 69.7231

Electronegativity: 1.81

Atomic Radius (Picometers): 130

Appearance: Silvery-White

Occurrence: Natural

Melting Point (Kelvin): 302.9146

Boiling Point (Kelvin): 2477

Stable Isotopes: 69, 71

Discoverer: Paul Emile Lecoq de Boisbaudran in 1875

Properties: Soft, Brittle

First Use: Unknown

Modern Uses: Semiconductors, Energy Storage

Picture Courtesy of foobar

©2011 Grant Dwyer

Zinc (Zn)

Atomic Number: 30

Relative Atomic Mass: 63.3824

Electronegativity: 1.65

Atomic Radius (Picometers): 135

Appearance: Silver-Grey

Occurrence: Natural

Melting Point (Kelvin): 692.68

Boiling Point (Kelvin): 1180

Stable Isotopes: 64, 66, 67, 68, 70

Discoverer: The Ancients

Properties: Hard, Brittle

First Use: Ornaments (1st Century BC)

Modern Uses: Galvanising, Dietary Supplement

Picture Courtesy of Alchemist-hp

©2011 Grant Dwyer

Copper (Cu)

Atomic Number: 29

Relative Atomic Mass: 63.5463

Electronegativity: 1.90

Atomic Radius (Picometers): 135

Appearance: Red-Orange

Occurrence: Natural

Melting Point (Kelvin): 1357.77

Boiling Point (Kelvin): 2835

Stable Isotopes: 63, 65

Discoverer: The Ancients 

Properties: Ductile, High Electrical Conductivity

First Use: Jewelry (9th Millennium BC)

Modern Uses: Textile Fibers, Wood Preservative

Picture Courtesy of Materialscientist

©2011 Grant Dwyer

Nickel (Ni)

Atomic Number: 28

Relative Atomic Mass: 58.693442

Electronegativity: 1.91

Atomic Radius (Picometers): 135

Appearance: Silver with Gold Tinge

Occurrence: Natural

Melting Point (Kelvin): 1728

Boiling Point (Kelvin): 3186

Stable Isotopes: 58, 60, 61, 62, 64

Discoverer: Axel Cronstedt in 1751

Properties: Ductile, Hard

First Use: Bronze (4th Millennium BC)

Modern Uses: Stainless Steel, Rechargeable Batteries

Picture Courtesy of Materialscientist

©2011 Grant Dwyer

Cobalt (Co)

Atomic Number: 27

Relative Atomic Mass: 58.9331955

Electronegativity: 1.88

Atomic Radius (Picometers): 135

Appearance: Lustrous Grey

Occurrence: Natural

Melting Point (Kelvin): 1768

Boiling Point (Kelvin): 3200

Stable Isotopes: 59

Discoverer: Georg Brandt in 1732

Properties: Ferromagnetic, Hard

First Use: Jewelry (3rd Millennium BC)

Modern Uses: Radioisotopes, Electroplating

Picture Courtesy of Alchemist-hp

©2011 Grant Dwyer