Iron (Fe)

Atomic Number: 26

Relative Atomic Mass: 55.8452

Electronegativity: 1.83

Atomic Radius (Picometers): 140

Appearance: Metallic with Grey Tinge


Occurrence: Natural

Melting Point (Kelvin): 1811

Boiling Point (Kelvin): 3134

Stable Isotopes: 56, 57, 58

Discoverer: The Ancients

Properties: Ferromagnetic, Ductile

First Use: Jewelry (3500 BC)

Modern Uses: Steel, Haber Process

Picture Courtesy of Waifer X


©2011 Grant Dwyer

Manganese (Mn)

Atomic Number: 25

Relative Atomic Mass: 54.9380455

Electronegativity: 1.55


Atomic Radius (Picometers): 140


Appearance: Silver


Occurrence: Natural

Melting Point (Kelvin): 1519

Boiling Point (Kelvin): 2334


Stable Isotopes: 55

Discoverer: Johan Gahn in 1774

Properties: Hard, Brittle, Paramagnetic

First Use: Paintings (Stone Age)

Modern Uses: Steel, Non-Rechargeable Batteries

Picture Courtesy of Tomihahndorf


©2011 Grant Dwyer

Chromium (Cr)

Atomic Number: 24

Relative Atomic Mass: 51.99616

Electronegativity: 1.66


Atomic Radius (Picometers): 140


Appearance: Silver


Occurrence: Natural

Melting Point (Kelvin): 2180

Boiling Point (Kelvin): 2944


Stable Isotopes: 52, 53, 54

Discoverer: Louis Nicolas Vauquelin in 1797

Properties: Hard, Brittle

First Use: Weapons (3rd Century BC)

Modern Uses: Polish, Dye

Picture Courtesy of Alchemist-hp


©2011 Grant Dwyer

Vanadium (V)

Atomic Number: 23

Relative Atomic Mass: 50.94151

Electronegativity: 1.63


Atomic Radius (Picometers): 135


Appearance: Blue-Silver-Grey


Occurrence: Natural

Melting Point (Kelvin): 2183

Boiling Point (Kelvin): 3680


Stable Isotopes: 51

Discoverer: Nils Sefstrom in 1830

Properties: Soft, Ductile

First Use: Cars (1927)

Modern Uses: Fusion Reactor, Ceramics

Picture Courtesy of Alchemist-hp


©2011 Grant Dwyer

Titanium (Ti)

Atomic Number: 22

Relative Atomic Mass: 47.8671

Electronegativity: 1.54


Atomic Radius (Picometers): 140


Appearance: Silvery Grey-White


Occurrence: Natural

Melting Point (Kelvin): 1941

Boiling Point (Kelvin): 3560


Stable Isotopes: 46, 47, 48, 49, 50

Discoverer: William Gregor in 1791

Properties: Low Density, Ductile, High Strength-Weight Ratio

First Use: Military (1950's)

Modern Uses: Toothpaste, Paper, Cement

Picture Courtesy of Alchemist-hp


©2011 Grant Dwyer

Scandium (Sc)

Atomic Number: 21

Relative Atomic Mass: 44.9559126

Electronegativity: 1.36


Atomic Radius (Picometers): 160


Appearance: Silvery White


Occurrence: Natural

Melting Point (Kelvin): 1814

Boiling Point (Kelvin): 3109

Stable Isotopes: 45


Discoverer: Lars Fredrik Nilson in 1879

Properties: Soft, Dissolves in Most Dilute Acids

First Use: Aluminium Alloys (1971)

Modern Uses: Lamps, Tracing Agents

Picture Courtesy of Alchemist-hp


©2011 Grant Dwyer

Calcium (Ca)

Atomic Number: 20

Relative Atomic Mass: 40.0784

Electronegativity: 1.00


Atomic Radius (Picometers): 180


Appearance: Dull Grey

Occurrence: Natural


Melting Point (Kelvin): 1115

Boiling Point (Kelvin): 1757

Stable Isotopes: 40, 42, 43, 44


Discoverer: Sir Humphry Davy in 1808

Properties: Soft, Good Electrical Conductor

First Use: Medicine (975)

Modern Uses: Making Acetylene Gas, X-ray Studies

Picture Courtesy of Matthias Zepper


©2011 Grant Dwyer

Potassium (K)

Atomic Number: 19

Relative Atomic Mass: 39.09831

Electronegativity: 0.82


Atomic Radius (Picometers): 220


Appearance: Silvery-Grey

Occurrence: Natural


Melting Point (Kelvin): 336.53 

Boiling Point (Kelvin): 1032

Stable Isotopes: 39, 41


Discoverer: Sir Humphry Davy in 1808

Properties: Very Reactive with Water, Soft

First Use: Clothing (Middle Ages)

Modern Uses: Fertiliser, Food

Picture Courtesy of images-of-elements.com

©2011 Grant Dwyer

Argon (Ar)

Atomic Number: 18

Relative Atomic Mass: 39.9481

Electronegativity: Unknown


Atomic Radius (Picometers): Unknown


Appearance: Colourless (Lilac/Violet when subjected to a High Voltage Electric Field)

Occurrence: Natural


Melting Point (Kelvin): 83.80

Boiling Point (Kelvin): 87.80

Stable Isotopes: 36, 38, 40


Discoverer: Sir William Ramsay in 1894

Properties: Odorless, Non-toxic, Inert, Monotomic

First Use: Unknown

Modern Uses: Medicine, Scientific Research

Picture Courtesy of Alchemist-hp


©2011 Grant Dwyer

Chlorine (Cl)

Atomic Number: 17

Relative Atomic Mass: 35.4532

Electronegativity: 3.16


Atomic Radius (Picometers): 100


Appearance: Yellow-Green

Occurrence: Natural


Melting Point (Kelvin): 171.6

Boiling Point (Kelvin): 239.11 


Stable Isotopes: 35, 37

Discoverer: Carl Wilhelm Scheele in 1774

Properties: Highly Reactive, Poisonous

First Use: Brine (6000 BC)

Modern Uses: Disinfection, Purification

Picture Courtesy of W.Oelen


©2011 Grant Dwyer