Flashcards for JEE Chemistry - Structure of Atom Class 11

 Page 1


Structure of Atom
Flash cards
Page 2


Structure of Atom
Flash cards
Rutherford Alpha Scattering Experiment
Page 3


Structure of Atom
Flash cards
Rutherford Alpha Scattering Experiment
Radius of Nucleus
R = R
0
A
1/3
......(i)
or R = 1.4 × 10
–15
A
1/3
metre .......(ii)
value of R
0
can be 1.1 × 10
–15
to 1.44 × 10
–15
metre.
Page 4


Structure of Atom
Flash cards
Rutherford Alpha Scattering Experiment
Radius of Nucleus
R = R
0
A
1/3
......(i)
or R = 1.4 × 10
–15
A
1/3
metre .......(ii)
value of R
0
can be 1.1 × 10
–15
to 1.44 × 10
–15
metre.
Rutherford Experiment Observation
1. Most of the a-particles (99.9%) passed through the foil 
without undergoing any deflection
2. Few a-particles underwent deflection through small angles
3. Very few a-particles (only one in 20000) were deflected 
back
Page 5


Structure of Atom
Flash cards
Rutherford Alpha Scattering Experiment
Radius of Nucleus
R = R
0
A
1/3
......(i)
or R = 1.4 × 10
–15
A
1/3
metre .......(ii)
value of R
0
can be 1.1 × 10
–15
to 1.44 × 10
–15
metre.
Rutherford Experiment Observation
1. Most of the a-particles (99.9%) passed through the foil 
without undergoing any deflection
2. Few a-particles underwent deflection through small angles
3. Very few a-particles (only one in 20000) were deflected 
back
Rutherford Conclusion
The corresponding conclusions drawn were
1. Most of the space within the atom is empty.
2. a-particle are positively charged particles, hence their 
deflection shows that all the positive charges (protons) within 
the atom are concentrated at the centre of the atom.
3. a-particle were deflected back because of concentration of 
the positive charge in the centre of atom and that too occupying 
a very small volume.