Glog from May 14 2015

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by adnanabdu
Last updated 7 years ago

Discipline:
Science
Subject:
Chemical Elements
Grade:
8

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Glog from May 14 2015

Cobalt

History

Cobalt is a hard, lustrous and a grey metal with symbol Co and atomic number 27. Cobalt is a transition metal with a close packed hexagonal (CPH) crystal structure at room temperature. Cobalt was discovered by Georg Brandt, a Swedish chemist, in 1739. Cobalt is used in alloys for aircraft engine parts and in alloys with corrosion/wear resistant uses. Cobalt is widely used in batteries and in electroplating. Cobalt salts are used to impart blue and green colors in glass and ceramics. Radioactive 60Co is used in the treatment of cancer.

Basic Info

Atomic Number 27 Number of electrons/protons: 27 Atomic Mass: 58.933 Boiling point: 3200 K (2927°C or 5301°F) Melting point: 1768 K (1495°C or 2723°F)Number of neutrons: 32 Element category: Trasition MetalPeriod/Group: 4 and the group is 9

Fun Facts #1* From 2006 to 2007 it counts for the fastest growing use of metal* Cobalt has a big use in rechargeable batteries.* Cobalt-57 can be used as a medicine.

Fun Facts #2* Cobalt is used in some paints, varnishes, and inks if a certain color is needed.* Cobalt has high strengths under high temperatures.*it turn pink when it dry.

Chemical PropertiesCobalt is a moderately reactive element. It combines slowly with oxygen in the air, but does not catch fire and burn unless it is in a powder form. It reacts with most acids to produce hydrogen gas. It does not react with water at room temperatures.

Physical Properties physical properties. Cobalt is a brittle, hard, silver-grey transition metal with magnetic properties similar to those of iron (it is ferromagnetic). It has a high melting point and is hard-wearing even at high temperatures.

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