Which of the following have no mass or charge ?
Alpha particles
Beta particles
Protons
Gamma rays
Neutrons possess ___________ charge .
neutral
positive
negative
none of these
Magnitude of the proton in an atom is equal to that of _________ .
electron
neutron
neutrino
antineutrino
Which of the following correctly represent the electronic distribution in the Mg atom?
3,8,1
2,8,2
1,8,3
8,2,2
The scientist who named cathode ray particle as electron :
J.J.Thomson
G.J..Stoney
Rutherford
Dalton
Thomson's atom model is known as __________ .
planetary model
plum pudding model
plannar model
Dalton's atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportion
(i), (ii) and (iii)
(i), (iii) and (iv)
(ii), (iii) and (iv)
(i), (ii) and (iv)
In the Thomson's model of atom, which of the following statements are correct?
(i) the mass of the atom is assumed to be uniformly distributed over the atom
(ii) the positve charge is assumed to be uniformly distributed over the atom
(iii) the electrons are uniformly distributed in the positively charged sphere
(iv) the electrons attract each other to stabilise the atom
(i), (ii), and (iii)
(i) and (iii)
(i) and (iv)
The electron distribution in an aluminium atom is ___________ .
2,8,3
8,2,3
2,3,8
Gamma rays are:
High energy electrons
Low energy electrons
High energy electromagnetic radiations
High energy positrons
