EASY
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Which model gives a more relevant structure of an atom ?

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Important Questions on Structure of The Atom

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Valence electrons in the element A are 3 and that in element B are 6. Most probable compound formed from A and B is
MEDIUM
The maximum number of electrons in a shell can be show by
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Nitrogen shows maximum covalency of 4 where as other heavier elements of the group show higher covalency because.
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Which of the following are deflected by the electric field?
MEDIUM

Identify the sets of quantum numbers which are not possible?

a. n=0, l=0, m1= 0, ms= +12b. n=1, l=0, m1= 0, ms= -12c. n=1, l=1, m1= 0, ms= +12d. n=2, l=1, m1=0, ms=-12

 

MEDIUM

Match the following :
List -I :
(a) Frequency of distribution of the emitted radiation from a black body
(b) Spin quantum numbers(ms)
(c) Angular Momentum
(d) All orbital have equal energy

List - II :
(i) degeneracy
(ii) temperature dependent
(iii) vector quantity
(iv) mass times velocity times radius 

Codes:

MEDIUM
Describe Thomson's model of atom. Why was it rejected?
HARD
What are the limitations of Thomson's model of atom? 
HARD
The structure of an atom is not yet completely solved and the latest particles discovered are gluons, quarks, antiquarks, and Higgs bosons. Protons and neutrons are made up of various combinations of quarks and gluons. If in the future any new elementary particles are discovered, can you speculate their properties?
HARD
Compare Thomson's, Rutherford's and Bohr's models of atom. 
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Who is known as Father of nuclear physics?
MEDIUM
Nucleus is positively charged whereas electrons are negatively charged but Niels Bohr proved that electrons never fall into the nucleus. Atom is always stable.
Why do electrons not fall into the nucleus?
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What do you think would be the observation if the α -particle scattering experiment is carried out using a foil of a metal other than gold?
MEDIUM
The journey from Dalton's model of atom to Thomson's model of atom to Rutherford's model of atom to Bohr's model of atom is a long and strenuous one. Each model has its merits and drawbacks. Even Bohr's model of atom is not the final answer to the structure of atom.
What value can you learn from the ongoing journey of the development of atomic structure from Dalton's model of atom to the present model of atom? Is this value applicable to the improvement of the standard of our life?
 
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J. J. Thomson led to the discovery of?
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What are the drawbacks of Rutherford's model of atom?
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Draw a sketch of hydrogen atom on a chart paper showing the nucleus and electron in the circular orbit.