Caesium :
Define: Caesium is alkali metal place in between Rubidium and Francium .it is soft and lustrous form.it is softest metal like soft wax .it is found in earth crust in the form of pollucite and lepidolite minerals . It is 5th number alkali metal
Discovery : caesium is discovered in 1860 by scientist Gustav Kirchhoff and Robert Burden
Origin of name :.The name Caesium is derived from Latin word ‘ Caesius’
Meaning of this word is sky blue and also derived from frame colour
Physical properties :
Atomic symbol: Caesium is denoted by symbol Cs
Atomic number : atomic number of Caesium is 55
In caesium 55 proton ,55 Electron is present
Atomic weight/ mass: atomic weight of Caesium is 132.9 Amu
In caesium 55 proton, and 78 neutron is present
Position : caesium is present in periodic table at 6th row ( period) and 1th column ( group)
Block : caesium is place in S block
Colour :caesium show silvery gold colour
Nature : caesium present in liquid form
Boiling point :boiling point of Caesium is 6710C
Melting point :melting point of Caesium is 28.5 0C
Isotopes:
Caesium show only 1 stable isotope
133Cs: atomic weight of this isotope is 132.9 Amu
In this isotope 55 proton, 55 Electron and 78 neutron is present
It is present 100% in nature
Caesium show radio active isotopes.
Chemical properties :
Electronic configuration
Electronic configuration of caesium is [ xe] 6S1
Electronic configuration in concert of shell is 2,8,18,18,8,1
Electronic structure
Valency : valency of caesium is 1
Atomic radius : Atomic radius of caesium is 303 Pm
Reactivity :. Caesium is quickly react with air and explosive with water
Uses:
Caesium is use in drilling fluid in petroleum industry
It is use to make special optical glass
Caesium is use as catalyst promoter in manufacturing process
It is most important use in caesium clock ( atomic clock ) is use in global positioning system ( GPS) satellites. Mobile phones network function
Caesium -137 isotope used in cancer treatment equipment
It is also use in photo electric cell and vacuum tubes
It is mostly used in IR lamps .
Question and Answer:
Q1. Define Caesium
Q2. Who discovered Caesium?
Q2. Physical properties of Caesium
Q4. Write Atomic Symbol of Caesium.
Q5. Write the Atomic number of Caesium.
Q6. On which block Caesium element is present?
Q7. What is the color of Caesium?
Q8. What is the Boiling point of Caesium?
Q9. What is the Melting point of Caesium?
Q10. Write the Isotopes of Caesium.
Q11. Show Electronic configuration of Caesium.
Q12. Write Electronic Structure of Caesium.
Q13. What is the Valency of Caesium?
Q14. Write the uses of Caesium element.