If new observations do not fit exactly with the current theory.
Scientists had made observations that did not fit exactly with Dalton's theory. Scientists changed the atomic theory to include this new knowledge. While the modern atomic theory is based on Dalton's theory, it is also very different.
new technology
something
It all happens suddenly
Moseley and Bohr
One of the greatest scientists of modern history known for predicting the potential of splitting the atom was Albert Einstein. His work on the theory of relativity laid the groundwork for understanding the relationship between mass and energy, eventually leading to the development of atomic energy and the atomic bomb.
The modern periodic table is arranged according to the elements' atomic numbers.
The atomic model was developed by various scientists over time, with contributions from Niels Bohr, Ernest Rutherford, and John Dalton. However, the modern atomic model that we use today, with electrons existing in energy levels around a nucleus, was largely proposed by Niels Bohr in 1913.
Homo sapiens
Modern scientists expanded upon the atomic theory by incorporating concepts from quantum mechanics, which introduced the idea that particles like electrons exhibit both wave-like and particle-like properties. They also recognized that atoms are not indivisible; instead, they consist of subatomic particles—protons, neutrons, and electrons. Additionally, the concept of isotopes emerged, highlighting that atoms of the same element can have different masses due to varying numbers of neutrons. These developments enhanced the understanding of atomic structure, behavior, and interactions.
no but modern understanding of the universe says this is not possible
bob