Answer:
The contributions are not listed in the question. I guess the following are the options you are talking about.
Same elements have same properties:
In 1803 Dalton gave the atomic theory that the properties of the atoms of the same element are same.
Electrons in Orbits:
Electrons were discovered in 1897 by J J. Thompson but the hypothesis of electrons in the orbits were given by Hantaro Nagaoka in 1904.
Plum pudding model:
Plum pudding model was given by J. J. Thompson in 1904 with the concept of positively charged medium containing the negatively charged electrons in it.
Positively Charged Atomic Nucleus:
Earnest Rutherford in 1911 discovered the positively charged atomic nucleus.
Answer:The tendency toward randomness drives the solution process. & The new solvent-solute intermolecular attractions must about the same as the solvent-solvent and solute-solute attractions.
Explanation:
Increase in entropy is a major driving force in chemistry. The dissolution of particles in solvent increases the entropy of the solution hence is a driving force and an important factor that influences solubility. Secondly, the degree of solute-solvent interaction must be approximately the same as that of solute-solute and solvent-solvent interaction since like dissolves like and dissolution of a solute in a solvent depends on intermolecular interaction between solute and solvent.
