1. Osmium:
Osmium is a element with chemical name Os and atomic number is 76. It is hard and brittle. This element contains traces of the platinum group. This Osmium metal is used to make Fountain pen nibs, Electronic circuit components. Osmium is one of the rarest and precious metal that is found on earth's Crust.
Osmium is a dense stable element twice dense than the Lead. Osmium is a bluish white color. This Element is extremely tough. This element has melting point of 3030 degree Celsius. Osmium is metal that is Lustrous even at the high temperatures.
2. Chromium :
Chromium is a metal with the chemical name Cr. The atomic number of chromium is 24. It is steely gray, Lustrous , hard and brittle transaction metal. Chromium metal is value for it's highly corrosive resistance and hardness. Chromium is mostly used in factories by combining with the stainless steel.
Chromium is having a highly resisting tarnishing ability. This is having a distinctive silver color. This is available abundance in earth's environment. This is used Chrome plating and pigment production.
3. Titanium :
Titanium is chemical element with the symbol Ti. The atomic number of Titanium is 22. It is found in nature as a oxide. It can be reduced to produce lustrous transition. It has low density and high strength. It is resistance to corrosion in sea water, aqua Regia and chlorine.
Titanium can be alloyed with various materials like iron, aluminum to produce stronger and light weighted aero space, military and other appliances. The most powerful properties are corrosion resistance and Strength to density ratio. The melting point of titanium is 1668 degree Celsius.
4. Tungsten :
Tungsten is a chemical element with a symbol W. The atomic number of Tungsten is 74. This element is remarkable for its robustness. It has high melting point of all elements bearing carbon. The melting point is 3410 degree Celsius. The density of the Tungsten is about 1.7 times much higher than of lead.
Tungsten is a ductile when it has a single crystalline. Tungsten is used in many fields like X-Rays, Radiation shield. Tungsten hardness makes it to use more in the military purposes. It has the lowest vapor pressure. Tungsten is malleable so that it can be easy to change it's form. It has high tensile strength.
5. Iridium :
Iridium is a chemical element with a symbol Ir. The atomic number of the element is 77. It is very hard and brittle. It is a Silvery-white transaction metal that is one of the platinum groups. It is considered as the second naturally occurring densest metal after osmium.
It is one of the most corrosion resistance metal even at the temperature as high as 2000 degree Celsius. Iridium resists such as Aqua Regia. Iridium is white, resembling platinum group. It is the only metal to maintain good mechanical properties. It has the 10th highest boiling point among all the metals.
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