Group+07

​​​​​​​Brandon S Group 7 includes:
 * Group 7 **
 * Manganese (Mn)
 * Technetium (Tc)
 * Rhenium (Re)
 * Bohrium (Bh)

Group 7's elements are all similar in electron pattern, because they all have 2 electrons in the outer shell and they all have similar chemical properties. Manganese, Technetium, Rhenium, and Bohrium are all metals and solids. Group 7 are all transition metals. A Transition metal is ductile and malleable.

Manganese's atomic number is 25 and its atomic mass is 54.93805. Manganese was discovered by Johann Gahn, a swedish chemist, in 1774. This is only 1 naturally occuring stable isotope. **__ Physical __** **__Chemical__** Manganese is a some what active metal. It can combine with oxygen to form Manganese Dioxide, very slowing. At higher temperatures it reacts quicker, it may burn and give of white light. Manganese can also combine with fluorine and chloride. Manganese isnt flamable. Manganese is mostly produced to becoome steel, iron, copper alloys. An alloy is made by mixing two or more melted metals. Alloys with Manganese make the mixture hard and resistant to rusting. It is also used in electrical instruments.
 * __Manganese: [[image:maganese.jpg width="255" height="253" align="right"]]__**
 * This element is gray-white metal that looks like steel.
 * It is a hard metal that is very brittle and easily oxidized.
 * Its melting point is 1246°C or 2275°F.
 * Its boiling point is 2061°C or 3742°F.
 * Manganese's thermal conductivity is 7.81 W-m -1 -K -1
 * Its denstiy is 7.21 g/cm -3
 * It is soluble in water.
 * __Uses__**

**__Fun Fact__** A contributor named Theodore Gray made a manganese bronze putter and sells them for $51


 * __Technetium:__**

Technetium's atomic number is 43 and its atomic mass is 98. Technetium was discover by Perrier and Segre in Italy in 1937. It has 9 Isotopes but none of them are stable. . **__Physical__** **__Chemical__** Technetium reacts with some aicds, but all. It also reacts with fluorine gas and with sulfur at high temperatures. It can burn in oxygen when a powder. Technetium is not flammable.
 * Technetium is a silvery-grey radioactive metal.
 * Its melting point is 2157°C.
 * Its boiling point is 4265°C.
 * Its densitiy is 11 g/cm -3
 * Technetium's thermal conductivity is 50.6 W-m -1 ​-K -1
 * It's solid at room temperature.
 * It is soluble in water.

Technetium is used as rust prevention and is used as a medical tool. As a medical tool it is injected into the body and it goes to certain organs then it gives off radiation that is easily detected. The amount of radiation given off indicates the problems in the organs.
 * __ Uses __**


 * __Rhenium:__**

Rhenium's atomic number is 75 and its atomic mass is 186.207. Rhenium was discovered by the German chemists Ida Tacke-Noddack, Walter Noddack, and Otto Carl Berg in 1925. It has one stable isotope.

**__Chemical__**
 * __Physical__**
 * Rhenium is a silvery-white metal
 * It is a solid at room temperature
 * Its melting point is 3186°C
 * Its boiling point is 5596°C
 * Its thermal conductivity is 48 W-m -1 -K -1
 * Rhenium's density is 21.02 g/cm -3
 * It is not soluble in water.

Rhenium is a stable metal. It does react with oxygen and some acids, and Rhenium is not flammable.

**__Uses__** Rhenium is used in alloys to make jet engine parts and gas turbine engines.

**__Fun Fact__**

Rhenium can be used in devices that control temperature like a thermostat.

**__Bohrium:__**

Bohrium's atomic number is 107 and its atomic weight it 264. Bohrium has no stable isotopes. It is a short-lived radioactive metal.

**__Uses__**

Has no uses.


 * __Fun Fact__**

Named Bohrium in honor of Niels Bohr.

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