we can know where the element is .
Pennsylvania
he did not develop anything regarding the 'atomic theory' for he was against that theory.
Niels Bohr is considered the founder of the modern atomic model.
The Electron Cloud model
No, the atomic theory is not always the model of matter. While the atomic theory is widely used and supported, there are other models, such as the quantum mechanical model, that provide a more detailed understanding of matter at the atomic and subatomic levels. These models build upon the atomic theory but also incorporate additional concepts from quantum mechanics.
Dalton's theory was irrelevant to the total compensation of of the Atomic Mass.
He started working on the atomic theory in 1892. He developed the Saturnian Model in 1904.
The most accurate, but not user friendly and usable model is the quantum mechanic atom model (QM model)
Thomson Atomic Model
I believe it is known as "Thomson's Model" or "Thomson's Atomic Model"
The quantum mechanical model of the atom, also known as the electron cloud model, shows electrons as existing in certain regions of space called orbitals. These orbitals represent the probability of finding an electron in a specific location around the nucleus.
The most commonly seen atomic theory is an amalgamation of the Rutherford and Bohr models, and therefore referred to a the Rutherford-Bohr model(1913) The most modern one is a model formed from theories by Werner Heisenberg and Ernest Schrodinger as well as others and is referred to as the Atomic orbital model(1927), but has been greatly improved on since then