No, atomic theory dates back to the 4'th century BC, approxixmately 2500 years ago with the musings of a Greek philosopher, Democrates. We're still not quite certain whether or not it is correct, but it has hung in there for all these years (in various refinements), and no other theory has successfully replaced it.
No, the concept of atoms has been around for centuries, originating in ancient Greek philosophy. The modern understanding of atoms as the basic building blocks of matter was developed in the late 19th century through the work of scientists like John Dalton and J.J. Thomson.
No, Dalton's atomic theory did not include the idea that all atoms of all elements are the same size. Instead, he proposed that atoms of different elements have different sizes and weights.
Dalton proposed that a chemical reaction is a rearrangement of atoms because he believed that in chemical reactions, atoms are not created or destroyed, but rather rearranged to form different compounds. This idea helped to explain how different elements combine to form new substances without changing the total number of atoms present.
No, chemical reactions do not produce new atoms. Atoms are rearranged in chemical reactions to form new substances, but the number of atoms remains constant before and after the reaction. This is known as the Law of Conservation of Mass.
During a chemical reaction, the atoms of the starting substance rearrange to form new substances. The atoms themselves are not created or destroyed, but they may bond in new combinations resulting in different molecules.
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 cannot be divided
to have an idea about atoms?
atoms
It was not John Dalton who first suggested the idea of atoms. It was the Greek philosopher and mathematician Democritus who first suggested the existence of atoms.
Aristotle
the Greeks. Atoms were thought to be the last indivisible units, but we've learnt how to split atoms.
The idea of atoms explains the conservation of matter. In chemical reactions, the number of atoms stays the same no matter how they are arranged. So, their total mass stays the same.
ancient Greece
2500
the greek years
All atoms of one type were identical in mass and properties. (Apex 2021)
No, Dalton's atomic theory did not include the idea that all atoms of all elements are the same size. Instead, he proposed that atoms of different elements have different sizes and weights.