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The modern understanding of atoms was significantly advanced by John Dalton in the early 19th century, who proposed the atomic theory, suggesting that matter is composed of indivisible atoms. Later, J.J. Thomson discovered the electron in 1897, revealing that atoms are not indivisible but contain smaller particles. This was further refined by Ernest Rutherford's gold foil experiment in 1909, which led to the discovery of the atomic nucleus. Together, these contributions laid the foundation for the contemporary atomic model.
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How where atoms discovered to be made of electrons?
1. Atoms are made from the atomic nucleus (protons plus neutrons) and electrons.2. For the discovery of electrons is credited J. J. Thomson in 1897.
What did Ernest Rutherford add to are knowledge of atoms?
Ernest Rutherford's gold foil experiment led to the discovery of the atomic nucleus and the proposal of the nuclear model of the atom. He demonstrated that atoms are mostly empty space with a dense, positively charged nucleus at the center. This helped pave the way for further understanding of atomic structure and the development of the modern atomic theory.
What did jj thomas discover?
J.J.Thomas discovered that atoms have negatively charged particles called electrons. He discovered this using the Cathode Ray. The cathode ray is a beam of electrons emitted by the cathode of an electrical discharged tube.
What aspect of Dalton's theory was not supported by Thomsons findings?
Dalton's theory proposed that atoms are indivisible and have no subatomic particles, which was not supported by Thomson's discovery of the electron. Thomson's findings showed that atoms contain subatomic particles, challenging the notion of indivisible atoms in Dalton's theory.
What ideas about atoms changed when new evidence was discovered?
atoms cannot be divided
What scientist discovered that atoms have distinct energy levels?
Niels Bohr discovered that atoms have distinct energy levels in 1913, while working on his model of the hydrogen atom. This discovery laid the foundation for our current understanding of atomic structure and how electrons move within atoms.
What did thompson contribute in forming the modern model of the atom?
JJ Thomson discovered that atoms were not indivisible because he discovered that atoms contained negatively charged subatomic particles which he called electrons.
When did sir john Joseph Thompson discovered the electron?
Sir Joseph John Thomson discovered the electron in 1897 through his cathode ray tube experiments, which demonstrated that cathode rays are composed of small, negatively charged particles. This discovery revolutionized the understanding of atomic structure and laid the foundation for modern physics.
How where atoms discovered to be made of electrons?
1. Atoms are made from the atomic nucleus (protons plus neutrons) and electrons.2. For the discovery of electrons is credited J. J. Thomson in 1897.
Describe the discovery that demonstrate for the first time that atoms are not the smallest particles of matter?
The discovery of the subatomic particles demonstrated for the first time that atoms are not the smallest particles of matter. Electron was the first subatomic particle discovered by J.J. Thomson.
Who made the earliest discovery of atoms?
Democritus, a Greek scholar, actually proposed the theory of tiny particles called atoms, but they weren't actually discovered by him but by a man by the name of John Dalton in the late 1700s.
What was the result of the discovered how atoms combine into molecules?
The discovery of how atoms combine into molecules led to the development of the field of chemistry. It provided an understanding of the fundamental building blocks of matter and how they interact to form different substances. This knowledge has been crucial in advancing various scientific and technological applications.
Whose discovery of radium changed the worlds view of the atoms?
Radium was discovered by the Curies in France in 1898, in samples of pitchblende which were found to be radioactive after removal of the uranium.
Who discovered that atoms have negative electric charge?
There were several scientists that discovered that atoms contained electric charges. One of the first to look at their charges more closely was J.J. Thomson.
Did martin klaproth discovered nuclear energy?
Martin Klaproth did not discover nuclear energy, he discovered the atoms uranium, zirconium, and cerium. The discovery of nuclear energy is credited to several people, including Albert Einstein and Marie Curie.
How did Thomson's discovery change Dalton's atomic theory?
Thomson discovered that atoms can be cut. He found this out while studying rays traveling between charged metal plates in a vacuum tube. He discovered that the rays were consisted of negatively charged particles. He had just discovered electrons. He discovered all of this on a trip from America. Since electrons are so small, he believed that they could only be from inside of the atom. Since Thomson's discovery of the electron, John Dalton's theory that atoms are indivisible had to be changed.
When did the discovery of the democritus come about?
Particular what discovery? Democritus discovered atoms it was 400 BC. He believed that all matters are composed of atoms. he also believed that one can could take a specimen of matter and keep on subdividing it until it could no longer be further subdivided. The smallest piece of indivisible matter was called atom. For Democritus, atoms of water were smooth and atoms of fire have sharp edges. by JOVENLO NEGRIDO. PHYSICAL SCIENCE (EAC CAVITE)
