Erbium ( Er ) :
Define – Erbium is inner transition metal place at 11 thnumber in lanthanide series
It is soft in nature and toxic element .it is also know as nuclear poison . It is present in earth crust in thd form of monazite and bastnaesite minerals it is found from mineral by the process of solvent extraction and ion exchange.
Discovery : Erbium is discovered in 1942 by scientist Carl Gustav Mosander
Origin of name :. The name Erbium gives after Sweden
Physical properties :
Atomic symbol: it is denoted by symbol Er
Atomic number : atomic number of Erbium is 68
In Erbium 68 proton and 68 electron is present
Atomic weight/ mass: atomic weight of Erbium is 167.25 Amu
In Erbium 68 proton and 99 neutron is present
Position : it is place in periodic table at 6th row ( period) and in lanthanide group
Block : it is place in f block
Colour :Erbium show silver colour
Nature : Erbium found in nature at solid state
Boiling point: boiling point of Erbium is 2868 0C
Melting point :melting point of Erbium is 1529 0C
Isotopes:
Erbium show 6 stable isotope
162Er: Atomic weight of this isotope is 161.9 Amu
In this isotope 68 proton,68 electron and 94 neutron is present
It is present 0.1% in nature
164Er: atomic weight of this isotope is 163.9 Amu
In this isotope 68 proton, 68 Electron and 96 neutron is present
It is present in 1.6% in nature
166Er: atomic weight of this isotope is 165.9 Amu
In this isotope 68 proton, 68 electron and 98 neutron is present
It is present 33.5% in nature
167Er: atomic weight of this isotope is 166.9 Amu
In this isotope 68 proton, 68 electron and 99 neutron is present
It is present 22.8 % in nature
168Er: atomic weight of this isotope 167.9 Amu
In this isotope 68 proton, 68 electron and 100 neutron is present
It is present 26.9 % in nature
170Er: atomic weight of this isotope is 169.9 Amu
In this isotope 68 proton, 68 electron and 102 neutron is present
It is present 14.9% in nature
Chemical properties :
Electronic configuration
Electronic configuration of Erbium is [ Xe ] 4f 12 6S2
Electronic configuration in concert of shell is 2,8,18,30,8,2
Electronic structure
Valency : Valency of Erbium is 3
Atomic radius : atomic radius of Erbium is 226 pm
Uses:
It is use to make optical enamel also use to make glass fibres
It is use to give colour to sunglass and imitation gems
Erbium is mixed with vanadium to improve their workability
It’s alloy use in dental surgery
It is also use to make glass jewellery
Erbium is use to make infrared absorbing glass .
Question and Answer:
Q1. Define Erbium
Q2. Who discovered Erbium?
Q2. Physical properties of Erbium
Q4. Write Atomic Symbol of Erbium.
Q5. Write the Atomic number of Erbium.
Q6. On which block Erbium element is present?
Q7. What is the color of Erbium?
Q8. What is the Boiling point of Erbium?
Q9. What is the MelErbiumg point of Erbium?
Q10. Write the Isotopes of Erbium.
Q11. Show Electronic configuration of Erbium.
Q12. Write Electronic Structure of Erbium.
Q13. What is the Valency of Erbium?
Q14. Write the uses of Erbium element.