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)
(i), (iii) and (iv)
Neutrons possess ___________ charge .
neutral
positive
negative
none of these
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 mass of electron was ______________ .
9.10 x 10-28 gm
9.10 x1028 gm
8 .10 x10-28 gms
9.10 x1010 gms
Nuclear model of the atom was proposed by:
Thomson
Neils Bohr
Moseley
Rutherford
Magnitude of the proton in an atom is equal to that of _________ .
electron
neutron
neutrino
antineutrino
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?
Gamma rays are:
High energy electrons
Low energy electrons
High energy electromagnetic radiations
High energy positrons
The specific charge of positive rays is maximum when the gas taken in the discharge tube is:
Oxygen
Nitrogen
Helium
Hydrogen
____________ are called canal rays .
Neutrons
Protons
Cathode rays
