Question

What experiment neglected thomsons model of the atom as an intimate mixture of negative and positive part ?

Answer 1

Answer:

Rutherford's Alpha Scattering Experiment

Explanation:

• According to Thomson's atomic model, an atom is represented as a pudding or cake of positively charged protons. This is a sphere of approximate radius $10^{-8}$ cm carrying protons in which negatively charged electrons are embedded.

• This model was discarded as it failed to explain the stability and electrical neutrality of an atom.

• Later in 1911, Rutherford's scattering experiment with alpha particles using the gold foil replaced Thomson's model suggesting that the distribution of protons and electrons is not uniform.

• According to Rutherford's nuclear model, most of the mass of an atom along with the positive charge was concentrated in an extremely small central region called the nucleus. This nucleus is surrounded by negatively charged electrons which move around it in orbits at a very high speed.    

• This model with the help of an α-particle scattering experiment explained the structure, stability and electrical neutrality of an atom and was able to disprove Thomson's model.

Hence Rutherford's scattering experiment neglected Thomson's model of the atom as an intimate mixture of negative and positive parts.