can any on tel me the draw backs of rutherford,neils bohr,j.j.thomson?

Answer 1

j j t researched on the basis of his theory of electron having no clear idea about what he doing. rutherford took j j t as basis and simply corrected him on the basis of experiments he performed. he gave a clear direction only about "what is where in an atom." bohr ended the controversy of science in rurtherford model introducing the concept of shells.

in fact what their drawback was that they had no clear idea about their work as they could not perform any enriched scientific experiment for the lackings of background theories and facilities.their models stood up on the base of analytic logics mainly.

Answer 2

We will start with the models of all of them.
JJThomson put forwarded the model of an atom to be consisting of equal number of negative and positive charges, i.e. the negatively charged electrons are embeded in a positively charged sphere like seeds of watermelon (seeds are electrons and watermelon is positively charged).

But he did not mentioned how they can be stable in such arrangement.
He did not mentioned the positive sphere is nucleus and does not contain the electrons within.

Rutherford discovered nucleus by bombarding alpha particles through the thin gold foil. And he mentioned that there is a large space between nucleus and the electrons.
The electrons are revolving around the nucleus.

But a revolving charged body around another charged body continiously emits energy. so electron will radiate energy continiously and gradually come closer and closer to the nucleus and the atom will be destroyed. But atoms are stable.

Bohr over come this drawback by mentioning that electrons revolve around the nucleus in fixed orbits. During their revolution they neither emit or absorb energy. But they can absorb and jump to next higher energy level but there they can not be stable and they radiate energy and come back to the lower orbit. The absorption of energy is quantised.

Later on it was found out that the hydrogen spectrum shows many lines. These lines under the influence of electric and magnetic field splits into two or more lines (stark and zeeman effect). Bohr's model con not explained this.
Also the lines when visualised under powerful microscope it consists of several line very closely spaced. this also he can not explained.

Answer 3

They're all dead? That's kind of a drawback for them, anyway.