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Dalton’s atomic theory is successfully explained by
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportion
Detailed Solution for Test: Structure Of The Atom- 1 - Question 2
Dalton's atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of different sizes and mass.
Rutherford’s scattering experiment fails for very small scattering angles because
Detailed Solution for Test: Structure Of The Atom- 1 - Question 3
Rutherford's scattering formula fails for very small scattering angles because due to the strong repulsive force present between the α-particles and the nucleus and also the full nuclear charge of the target atom is partially screened by its electrons.
The conclusion of Rutherford’s scattering experiment does not include
Detailed Solution for Test: Structure Of The Atom- 1 - Question 4
From the α scattering experiment, Rutherford concluded that:
There is a positively charged centre in the atom called the nucleus. Nearby all the mass of an atom resides in the nucleus.
Electrons revolve around the nucleus in well-defined orbitals.
The size of the nucleus is very small compared to that of an atom. (i) Scattering follows Columb's law (ii) Radius of the nucleus is less than 10−14 m (iii) α particles can approach with a distance of the order of 10−14 m of the nucleus.
When alpha-particles are sent through a thin metal foil, most of them go straight through the foil because_______.
Detailed Solution for Test: Structure Of The Atom- 1 - Question 6
When alpha particles are sent through a thin metal foil, most of them go straight through the foil because most part of the atom is empty space. In other words, there is no obstruction in the path of alpha particles.
Rutherford’s a-particle scattering experiment showed that
(i) electrons have negative charge
(ii) the mass and positive charge of the atom is concentrated in the nucleus
(iii) neutron exists in the nucleus
(iv) most of the space in atom is empty
Which of the above statements are correct?
Detailed Solution for Test: Structure Of The Atom- 1 - Question 8
Points (ii) and (iv) are correct. An atom consists of a positively charged, dense and very small nucleus which have all the protons and neutrons. Positive charge is due to protons, as neutrons have no charge. Most of the space is empty because most of the alpha particles pass straight through the gold foil without any deflection.
Electrons have negative charge, it was explained by Thomson. The existance of neutron was discovered by Chadwick.
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