It was then changed to "All atoms of the same element contain the same number of protons and electrons, but atoms of a given element may have different numbers of neutrons." after James Chadwick discovered that the nuclei of most atoms contain neutrons as well as protons.
These ideas are:· "All atoms of a given element are identical" : discovery of isotopes.· "A given compound always has the same relative numbers of types of atoms" : discovery of nonstoichiometric compounds.
radioactivity proves that there are smaller particles in an atom that makes it up, they are proton, neutron, and electron. Dalton's atomic theory clearly states that the atom is the simplest particle. Radioactivity contradicts Dalton's theory since it proves that there are particles which are simpler than the atom.
Dalton's theory said that "atoms of the same element are the same as each other in terms of mass, color, and size." We know that this cannot be true because isotopes of the same element, oxygen for example O-16 and O-17, have different mass numbers (atomic mass). Dalton's theory said that "atoms of the same element are the same as each other in terms of mass, color, and size." We know that this cannot be true because isotopes of the same element, oxygen for example O-16 and O-17, have different mass numbers (atomic mass).
Atoms are made up of smaller particles.
Dalton's atomic theory stated that atoms of a given element are identical in all respects, which we now know is incorrect as atoms can exist as isotopes with different numbers of neutrons. Additionally, atoms were thought to be indivisible, but we now know they can be broken down into subatomic particles like protons, neutrons, and electrons.
Atoms may not be changed into other atoms.
These ideas are:· "All atoms of a given element are identical" : discovery of isotopes.· "A given compound always has the same relative numbers of types of atoms" : discovery of nonstoichiometric compounds.
Yes.
Atoms may not be changed into other atoms.
1.I had no evidence to contradict the theory.2.I didn't have any evidence that i could use to contradict the theory.
A discovery that shows species appearing suddenly in the fossil record without any preceding ancestors would provide evidence against the theory of evolution. This would contradict the gradual changes in species predicted by evolution.
radioactivity proves that there are smaller particles in an atom that makes it up, they are proton, neutron, and electron. Dalton's atomic theory clearly states that the atom is the simplest particle. Radioactivity contradicts Dalton's theory since it proves that there are particles which are simpler than the atom.
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Bohr's reduced mass theory predicted the existence of isotopes. Urey used this theory to isolate the heavy isotope of hydrogen, deuterium, by separating it from normal hydrogen using fractional distillation. This discovery confirmed the existence of isotopes and provided evidence for the theory of nuclear structure.
One part of Dalton's atomic theory that was proved incorrect is the assumption that atoms are indivisible and cannot be further subdivided. The discovery of subatomic particles such as protons, neutrons, and electrons showed that atoms are made up of smaller components.
the Greek Philosophers did not test their theory.
The discovery of subatomic particles like electrons, protons, and neutrons contributed to a better understanding of the structure of atoms. Isotopes, which are atoms of the same element with different numbers of neutrons, helped refine the atomic theory by explaining variations in atomic mass. Together, these discoveries have shaped our modern understanding of atomic structure and behavior.