### element | metal:

Potassium metal
* is an example of a pyrophoric material
  - dropped in a lake
  - produced by combining potassium chloride with sodium metal at high temperatures
  - very dangerous and can form an explosive coating if it is kept in air
* major fire risk since it catches fire when reacting with water.
+ Potassium, Safety: Alkali metals :: Chemical elements
  * Potassium metal is very dangerous and can form an explosive coating if it is kept in air. It also reacts violently with water, spewing corrosive liquid all over. Potassium compounds are not normally dangerous, unless they contain a toxic anion like chromate or chlorate.

### element | metal | potassium:

Adequate potassium
* helps onion plants better withstand injurious cold.
* is essential for fruit formation, optimum yields and high quality.

Elevated potassium
* affects all cells of the body but particularly nerves and muscles.
* stops the heart.

Excess potassium
* can aggravate the uptake of magnesium, manganese, zinc and iron.
* induces larval metamorphosis in four marine invertebrate species
  - magnesium and calcium deficiency
* interferes with calcium and magnesium absorption.
* leaves the cell causing a brief hyperpolarization.

Excessive potassium
* can be detrimental to a peanut crop
  - lower calcium levels
* causes chlorosis, poor root growth, and wilted new shoots.
* interferes with heart function and leads to heart block and cardiac arrest.

Insufficient potassium
* can also exaggerate the effects of sodium.
* is one of the main causes of fatigue, muscle cramping and dehydration.

Low potassium
* can cause muscle cramping and cardiovascular irregularities
  - lead to low urine citrate, which is the direct reason for increased stone risk
* is called hypokalemia.
* prevents the stem end of the fruit from developing properly.

Potassium supplementation
* helps to avoid deficiency.
* is contraindicated when a potassium-sparing diuretic is given.

Powder metal
* can also be injection molded instead of compacted.
* do absorb microwave radiation and can be heated and sintered, using microwaves.
* is an energy and material saving process.

### element | metal:

Praseodymium
* are chemical elements
  - metallic elements
* component of our glass blowing specticles.
* is also a component of didymium glass
  - considered to be moderately toxic
  - one of the lanthanide rare earth metals
* is one of the more abundant of rare-earth elements
  - common lanthanides
  - soft, silvery, malleable, and ductile
* is used in special alloys and glasses
  - to make specialized yellow glass goggles for glass blowers and welders
* malleable and ductile silver colored metal.
* rare-earth metal of the lanthanide series in group IIIb of the periodic table
  - metal, and is also a member of the lanthanide series
* reacts with water to form praseodymium hydroxide plus hydrogen gas.
* silvery rare-earth metal that is soft, malleable and ductile
  - white, fairly soft, malleable, and ductile metal
* soft malleable, silvery-yellow metal.
* soft, malleable, ductile metal with a yellowish, metallic shine
  - ductile, silver-yellow metal
  - silvery, malleable, and ductile metal in the lanthanide group
* typical metal, somewhat similar to aluminum, iron, or magnesium.

Pure metal
* Most pure metal has physical properties
  - metals are either too soft, brittle or chemically reactive for practical use
* are elements which comes from a particular area of the periodic table.
* have low recrystallization temperatures as compared with alloys.

Rhenium
* Most rhenium by-product of the copper industry.
* are chemical elements
  - transition metal
* forms a superconductive alloy with molybdenum.
* is metal
  - rare and is used in special light bulb filiments
* ranges in color from silvery - white to gray to a black powder.