![]() In 1913 Bohr proposed his quantized shell model of the atom to explain how electrons can have stable orbits around the nucleus. This theory led to the modern understanding of atoms. John Dalton was a chemist who made many contributions to science, though his most important contribution was the atomic theory: matter is ultimately made of atoms. Who made the most significant contribution to the atomic theory? He also theorized that electrons move in definite orbits around the nucleus, much like planets circle the sun. He built on the concept that the mass of an atom is contained mostly in the nucleus. In 1913, the Danish scientist Niels Bohr proposed an improvement. What did Bohr contribute to the atomic theory apex? Because the ratios were the same, Dalton was able to say that atoms of different elements combine in whole number ratios. Thompson, Ernest Rutherford, Niels Bohr, James Chadwick and Ernest Schrodinger each contributed greatly to the modern atomic theory by finding the actual evidence. What was their contribution to atomic theory? Bohr was the first to discover that electrons travel in separate orbits around the nucleus and that the number of electrons in the outer orbit determines the properties of an element. ![]() The Bohr model shows the atom as a small, positively charged nucleus surrounded by orbiting electrons. What were the contributions of Bohr to the atomic model? 7 How did Neils Bohr change atomic theory?.6 What did Bohr introduce to atomic theory with his model?.5 Why is the Bohr model important to the atomic theory?.4 What model of the atom did Bohr develop?.3 Who made the most significant contribution to the atomic theory?. ![]()
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