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John Dalton
Daltons Law of Partial Pressures- The total pressure of a mixture of gases amounted to the sum of the partial pressures that each individual gas exerted while occupying the same space. All matter was composed of atoms, indivisible and indestructible building blocks. Conclusions-He found that elements consist of invisible small particles. Atoms can neither be created nor destroyed. All atoms of the same element are identical; different elements have different types of atom -
JJ Thompson
Tiny negatively charged subatomic particles or electrons.
Conclusion- Proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup." -
Ernest Rutherford
He thought that the atom is mostly empty space, with nearly all of its mass concentrated in a tiny central nucleus. Conclusion- He proposed the laws of radioactive decay -
Neils Bohr
He had a theory about the hydrogen atom. Conclusions-He proposed that electrons travel in orbits around the nucleus and the inner orbits hold fewer electrons than the outer orbits. Outer orbits determine the chemical properties of an atom. Were the basis for quantum mechanics