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Displaying 5 out
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questions & answers.
Q1.
The modern atomic theory correlates and contradicts with - Dalton's atomic theory. Give reasons for the same.
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answer not shownQ2.
The above diagrams represents the experiments conducted by
- J.J. Thompson which led to the discovery of electrons
- Goldstein's experiment which led to the discovery of protons
- Rutherford's experiment which led to the discovery of the atomic nucleus.
Match the statements in - Column I pertaining to the discovery of the structure of an atom with the relevant continuity statement in - Column II.
| COLUMN I | COLUMN II |
| A. J.J. Thompson studied the characteristics of cathode rays and found that | 1. unit positive charge and a mass equal to 1837 times the mass of an electron [i.e. mass equal to 1 atomic mass unit]. |
| B. Electrons are also emitted by | 2. most of the matter in an atom is located in a very little space called 'nucleus' and electrons revolve around the nucleus to confer stability of the atom. |
| C. The charge and mass of an electron is | 3. neutral i.e.. carry no electric charge and have a mass almost equal to the mass of a proton [i.e. mass equal to 1 atomic mass unit]. |
| D. Goldstein discovered rays emitted from the anode | 4. nucleons |
| E. The charge and mass of a proton is | 5. in the nucleus of an atom are present particles which possesses no charge but have a mass equal to that of protons. |
| F. Lord Rutherford studied the atomic model and through his experiments of projection of alpha particles on thin metallic sheets discovered | 6. they contain negatively charged particles now called 'electrons'. |
| G. The conclusion drawn from Rutherford's atomic model were that | 7. unit negative charge and a mass 1/1837 of the mass of a hydrogen atom or proton [i.e. negligible mass] |
| H. James Chadwick discovered the neutron and concluded that | 8. action of heat or U.V. light on certain metals. |
| I. The charge and mass of a neutron is | 9. consisting of positively charged particles called 'protons'. |
| J. Protons and neutrons are together known as | 10. the atomic nucleus. |
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answer not shownQ3.
The diagram below represents an atom. Complete the labelling of the atom given below indicating the subatomic particles, nucleus and orbits.
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Q4.
The symbols given below represent the subatomic particles i.e., protons, electrons and neutrons. Complete the blanks for the subscript and superscript numbers of 'e' and 'n'.
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answer not shownQ5.
Complete the statements given below :
- The protons and neutrons are present in the _____________ of an atom.
- The subscript number of 'p' represents the charge/mass.
- The mass of a proton is equal to _____________ a.m.u. [atomic mass units]
- Protons carry unit positive/negative charge, while electrons carry unit positive/negative charge.
- The mass of an electron is considered as 1 a.m.u/negligible.
- The superscript on 'n' represents its charge/mass.
- The electrons revolve around the nucleus in imaginary paths called _____________.
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- nucleus
- charge
- 1 a.m.u.
- positive
- negligible
- mass
- orbitals
