Question

Name Development of Modern Atomic Theory -Video worksheet 1. The development of atomic theory started over 2000 years ago with a man named 2. He believed that all matter is made up of tiny particles called 3. Who was the next person to advance atomic theory in 1808? and 4. He thought that atoms of a given element are identical in other properties. Today we know this to NOT be true because of 5. 90 years later, a man named JJ. Thompson discovered the _ in 1897. 6. His model of the atom is referred to as the model. 7. A Crooke's tube is essentially the same as a _tube. 8. Emest Rutherford won the nobel prize in 1908 for his discovery of the 9. His famous experiment is known as the experiment. 10. Rutherford's model of the atom is known as the _model of the atom. 11. What are the tiny particles in the nucleus of the atom? 12. Who was the Danish physicist who won the nobel prize in 1922? 13. In his model, electrons move around the nucleus of the atom in a motion. is emitted with energy E= hf when an electron 14. In the Bohr model, a jumps down from one orbit to another. 15. Louis de Broglie was a French physicist who made groundbreaking contributions to theory. 16. He postulated that all matter exhibits properties Wave 17. Our current understanding of the atom is based on the Mechanical Model of the Atom. 18. The Heisenberg Uncertainty Principle states that no experiment can measure both the of a quantum particle simultaneously. and exhibit 19. The Schrodinger wave equation shows that atomic particles like wave-like behaviors. of finding an 20. The wave mechanical model of the atom shows the electron in an atom.

Answer 1

1. Development of atomic theory was first formulated before 2000 years ago (around 600 BC) by an indian philosopher acharya Kanad.

Another greek philisopher Democritus , around 300 BC also developed a theory of matter .

2. He believed that all matter is made of any tiny particle called Paramanu.

According to Democritus all matter is made of any tiny particle called atomos .

3.

Next person that devlooed advance atomic theory at 1808 was John Dalton.

4.

He thought that atoms of a given element are identical in size , mass and other properties.

5.

90 years later in 1897, J J. Thompson discovered the negative charged particle called electron.

6.

His model of atom is known as Plum pudding model.

7. A crooke's tube is essentially the same as glass tube.

8.

Ernst Rutherford won the nobel prize in 1908 for the discovery of the structure of atom.

9. His experiment is known as Gold foil experiment.

10.

His model was an landmark model of atom.

It is known as nuclear or planetary model of thr atom.

11. Tiny paricles in nucleus of an atom are proton and neutron.

12. Niels Bohr got noble prize in 1922.

13. In his model electrons move around the nucleus of the atom in a circular path.

14. In Bohr model a light (photon) is emittted with energy when an electron jumps down from one orbit to another.