MEDIUM
9th CBSE
IMPORTANT
Earn 100

Why do Helium, Neon and Argon have a zero valency?

Important Questions on Structure Of The Atom

HARD
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 4 - Structure Of The Atom>Long Answer Questions>Q 37
The ratio of the radii of hydrogen atom and its nucleus is ~105. Assuming the atom and the nucleus to be spherical, what will be the ratio of their sizes?
HARD
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 4 - Structure Of The Atom>Long Answer Questions>Q 37

The ratio of the radii of hydrogen atom and its nucleus is ~105. Assuming the atom and the nucleus to be spherical, if atom is represented by planet earth 'Re' = 6.4×106 m, estimate the size of the nucleus. 

HARD
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 4 - Structure Of The Atom>Long Answer Questions>Q 38
Enlist the conclusions drawn by Rutherford from his α-ray scattering experiment. 
MEDIUM
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 4 - Structure Of The Atom>Long Answer Questions>Q 39
In what way is the Rutherford's atomic model different from that of Thomson's atomic model? 
HARD
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 4 - Structure Of The Atom>Long Answer Questions>Q 40
What were the drawbacks of Rutherford's model of an atom?
MEDIUM
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 4 - Structure Of The Atom>Long Answer Questions>Q 41
What are the postulates of Bohr's model of an atom? 
HARD
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 4 - Structure Of The Atom>Long Answer Questions>Q 42
Show diagrammatically, the electron distributions in sodium atom and sodium ion, and also give their atomic number.
HARD
9th CBSE
IMPORTANT
NCERT Exemplar Science - Class 9>Chapter 4 - Structure Of The Atom>Long Answer Questions>Q 43
In the Gold foil experiment of Geiger and Marsden, that paved the way for Rutherford's model of an atom, ~ 1.00 % of the α -particles were found to deflect at angles >50° If one mole of α-particles were bombarded on the gold foil, compute the number of α-particles that would deflect at angles less than 50° .