I think it was that he theorized that when a new substance is made, the elemnts didn't change the atoms just rearranged.
I'm not certain though. Galileo is more known for his research on planets.
Neil Bohr's contribution in the development of atomic theory is that, atoms are very tiny particles that cannot be seen by our naked eye.
He determined the number of positive charges in the nucleus of an atom. He was the first one to bring the concept of atomic number.
Neil bohr has done research in quantum mechanics.
Nothing. He contributed to the evolving body of speculation about the atom, by translating Epicurus who had developed his ideas from Leucippus and Democritus; but nothin to its history
Dalton's atomic theory was a major contribution to discover the atomic structure in despite of been completely counterproved.
He proposed the wave-particle duality for the electrons.
Antoine Lavoisier was a French nobleman and chemist. His contribution to the development of the modern atomic theory was his idea of the possibility of an Atomic Mass.
He determined the number of positive charges in the nucleus of an atom. He was the first one to bring the concept of atomic number.
Henry Moseley showed elements in the periodic table should be in order by their atomic number instead of atomic mass.
Neil bohr has done research in quantum mechanics.
The contribution of anyone prior to about 1600 to the development of atomic theory might as well be "nothing whatsoever." Democritus and/or Leucippus contributed the name "atomos", but not much else; they were wrong about nearly every detail. John Dalton is just about the earliest scientist to have had any significant contribution to atomic theory, and most of what we now consider atomic theory was developed since about 1900.
big balls that clack together make a good noice
Atomic Theory
Creation of the atomic bomb
That the cake is a lie.
The first atomic bomb
The most important contribution of Werner Heisenberg was the discovery of the uncertainty principle.
explain how the development of atomic models demonsrates the scientific prosess