Zinc

Source of the photo: 
http://www.google.hu/imgres?imgurl=http://www.vitaminbank.hu/tapanyagok/nyomelemek/cink.bmp
Author of the description: 
Gruiz Katalin
Fém cink

Atomic number

30

Atomic mass

65.37 g.mol -1

Electronegativity                     

1.6

Density

7.11 g.cm-3 at 20°C

Melting point

420 °C

Boiling point

907 °C

Vanderwaals radius

0.138 nm

Ionic radius

0.074 nm (+2)

Isotopes

10

Electronic shell

[ Ar ] 3d10 4s2

Energy of first ionisation

904.5 kJ.mol -1

Energy of second ionisation

1723 kJ.mol -1

Standard potential

- 0.763 V

Discovered

Andreas Marggraf in 1746

 

Zinc is a lustrous bluish-white metal. It is found in group IIb of the periodic table. It is brittle and crystalline at ordinary temperatures, but it becomes ductile and malleable when heated between 110°C and 150°C. It is a fairly reactive metal that will combine with oxygen and other non-metals, and will react with dilute acids to release hydrogen.

Applications

It is used principally for galvanizing iron, more than 50% of metallic zinc goes into galvanizing steel, but is also important in the preparation of certain alloys. It is used for the negative plates in some electric batteries and for roofing and gutters in building construction.
Zinc is the primary metal used in making American pennies, is used in die casting in the automobile industry. Zinc oxide is used as a white pigment in watercolours or paints, and as an activator in the rubber industry. As a pigment zinc is used in plastics, cosmetics, photocopier paper, wallpaper, printing inks etc, while in rubber production its role is to act as a catalyst during manufacture and as a heat disperser in the final product. Zinc metal is included in most single tablet, it is believed to possess anti-oxidant properties, which protect against premature aging of the skin and muscles of the body.

Source of description: 

Mokka-Körinfo Lexikon

http://www.lenntech.com/periodic/elements/zn.htm