Question

QUESTION – 1 Answer the following questions-

1. Explain Daltons atomic theory

2. How were electron- cathode rays discovered

3. Write important characteristics of cathode rays

4. Explain Thomsons model of an atom

5. Write important characteristics of electron, proton and neutron

6. Explain Rutherfords – rays scattering experiment

7. Write observations of Rutherfords rays scattering experiment

8. What conclusion were derived about the nucleus of an atom from Rutherfords rays scattering experiment

9. Explain Rutherfords model of an atom

10.Write failure of Rutherfords model of an atom


11.Explain about Bohrs model of an atom​

Answer 1

Explanation:

1. A theory of chemical combination, first stated by John Dalton in 1803. It involves the following postulates: (1) Elements consist of indivisible small particles (atoms). (2) All atoms of the same element are identical; different elements have different types of atom. (3) Atoms can neither be created nor destroyed.
2. J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson proposed the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup."
3. 1: Cathode rays travel in a straight line and can cast sharp shadows. Property 2: Cathode rays are negatively charged. Property 3: Electric field and magnetic field deflect cathode rays. ... Property 9: Phosphors glow when cathode rays fall on them.
4. J.J. Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup."
5. are a type of subatomic particle with a negative charge. Protons are a type of subatomic particle with a positive charge. Protons are bound together in an atom's nucleus as a result of the strong nuclear force. Neutrons are a type of subatomic particle with no charge
6. rutherford designed an experiment for this. In this experiment, fast moving alpha (α)-particles were made to fall on a thin gold foil. He selected a gold foil because he wanted as thin a layer as possible. This gold foil was about 1000 atoms thick. α-particles are doubly-charged helium ions.

Answer 2

Answer:

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