Rutherford's α- particles scattering experiment showed that
(i) atoms are spherical in shape and mostly hollow .
(ii)atom is stable
(iii) the electrons are seen inside the nucleus .
(iv) electrons revolve around the nucleus ,like planets around the sun .
(i) and (iv)
(ii) and (iii)
(ii)
(iii)
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), (iii) and (iv)
Neutrons possess ___________ charge .
neutral
positive
negative
none of these
The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?
The scientist who named cathode ray particle as electron :
J.J.Thomson
G.J..Stoney
Rutherford
Dalton
The specific charge of positive rays is maximum when the gas taken in the discharge tube is:
Oxygen
Nitrogen
Helium
Hydrogen
Gamma rays are:
High energy electrons
Low energy electrons
High energy electromagnetic radiations
High energy positrons
____________ are called canal rays .
Neutrons
Protons
Cathode rays
The mass of electron was ______________ .
9.10 x 10-28 gm
9.10 x1028 gm
8 .10 x10-28 gms
9.10 x1010 gms
Thomson's atom model is known as __________ .
planetary model
plum pudding model
plannar model
