Question

Which statement are correct-

(A)The plum pudding model was given by Niels Burr.
(B)The atomic theory of matter was given by J.J. Thomson.
(C)Rutherford is considered the father of modern chemistry.
(D)Electron's anti-particle is beta-particle.

 

1. Option A,B & C
2. Option A & B
3. Option C & D
4. None 

Answer 1

Correct Answer - Option 4 : None 

The correct answer is None.

• Plum Pudding Model-
  • Thomson's atomic model, an earliest theoretical description of the inner structure of atoms, proposed about 1900 by William Thomson and strongly supported by Sir Joseph John Thomson, who had discovered (1897) the electron, a negatively charged part of every atom.
  • Though several alternative models were advanced in the 1900s by Kelvin and others, Thomson held that atoms are uniform spheres of positively charged matter in which electrons are embedded.
  • Popularly known as the plum pudding model, it had to be abandoned (1911) on both theoretical and experimental grounds in favor of the Rutherford atomic model, in which the electrons describe orbits about a tiny positive nucleus.
• Atomic theory-
  • ​Atomic theory, ancient philosophical speculation that all things can be accounted for by innumerable combinations of hard, small, indivisible particles (called atoms) of various sizes but of the same basic material. 
  • And the modern scientific theory of matter according to which the chemical elements that combine to form the great variety of substances consist themselves of aggregations of similar subunits (atoms) possessing nuclear and electron substructure characteristic of each element.
• Electron-
  • The electron was discovered in 1897 by the English physicist J.J.Thomson during investigations of cathode rays.
  • His discovery of electrons, which he initially called corpuscles, played a pivotal role in revolutionizing knowledge of atomic structure.
  • In any given atom, electrons move about the nucleus in an orderly arrangement of orbitals, the attraction between electrons and nucleus overcoming repulsion among the electrons that would otherwise cause them to fly apart. 
  • Within the field of particle physics, there are two ways of classifying electrons. The electron is a fermion, a type of particle named after the Fermi-Dirac statistics that describe its behavior.
  • Electron, the lightest stable subatomic particle known. It carries a negative charge of 1.602176634 × 10−19 coulomb, which is considered the basic unit of electric charge.
  • The rest mass of the electron is 9.1093837015 × 10−31 kg.
• ​Positron,
  • It is also called a positive electron, a positively charged subatomic particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of a negative electron.
  • The first of the antiparticles to be detected, positrons were discovered by Carl David Anderson in cloud-chamber studies of the composition of cosmic rays (1932).