Iridium
Define: Iridium is transition metal place in between Rhodium and Meitnerium.it show hard ,brittle , lustrous properties. Is it 2 number densest metal . It is corrosion inhibitor .and does not affected by air and water . It have high melting point and low toxicity .it show properties like platinum family . Iridium means iris rainbow . It conduct electricity and heat. Iridium is found in earth crust in osmiridium (osmium rich) and iridium ores.
Discovery : iridium is discovered in 1803 by scientist Smithson Tennant
Origin of name :. The name iridium is discovered by Greek goddess of the rainbow
Physical properties :
Atomic symbol: Atomic symbol of iridium is Ir
Atomic number : Atomic number of iridium is 77
In iridium 77 proton and 77 Electron is present
Atomic weight/ mass: Atomic weight of iridium is 192.2 Amu
In iridium 77 proton and 115 neutron is present
Position : It is place in periodic table at 9thcolumn ( group ) and 6th period ( row )
Block : It is place in d block
Colour : Iridium show silver white colour
Nature : Iridium present in solid state
Boiling point : Boiling point of Iridium is 4428 0C
Melting point : Melting point of Iridium is 2446 0C
Isotopes: iridium show 2 stable isotopes
191Ir: atomic weight of this isotope is 190.96 Amu isotopes
In this isotope 77 proton ,77 Electron and 114 neutron is present
It is present 37.3% in nature
193Ir: Atomic weight of this isotope is 192.96 Amu
In this isotope 77 proton, 77 Electron and 116 is present
It is present 62.7% in nature
Chemical properties :
Electronic configuration
Electronic configuration of Iridium is [ Xe ] 4f14 5d7 6s2
Electronic configuration in concert of shell is ( 2,8,18,32,15,2 )
Electronic structure
Valency : Valency of iridium is 2,3 or 4
Atomic radius : Atomic radius of iridium is 180 Pm
Uses:
- It is use as hardening agent in platinum alloy
- Iridium is use to making crucible
- Its alloy use to make tripping pens and compass bearings
- It’s radioactive isotope used in radiation therapy for cancer treatment
- Iridium use to making heavy duty electrical contact
- Iridium have high melting point and used in spark plugs particularly in activation
- It is used for touch holes or vent pieces bearings
Question and Answer:
Q1. Define Iridium
Q2. Who discovered Iridium?
Q2. Physical properties of Iridium
Q4. Write Atomic Symbol of Iridium.
Q5. Write the Atomic number of Iridium.
Q6. On which block Iridium element is present?
Q7. What is the color of Iridium?
Q8. What is the Boiling point of Iridium?
Q9. What is the Melting point of Iridium?
Q10. Write the Isotopes of Iridium.
Q11. Show Electronic configuration of Iridium.
Q12. Write Electronic Structure of Iridium.
Q13. What is the Valency of Iridium?
Q14. Write the uses of Iridium element.
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