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Why was it necessary to consider the exi...

Why was it necessary to consider the existence of neutrons in the nucleus of an atom?

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The actual mass of an atom of an element, except hydrogen, is greater than the sum of the masses of protons and electrons presennt in that atom. Hence, rutherford in 1920, proposed the existence of an uncharged particle in an atom having unit mass. This particle was called neutron.
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CHHAYA PUBLICATION-STRUCTURE OF ATOM-WARM UP EXERCISE
  1. Explain the generation of the positively charged particle in the disch...

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  2. How many protons will be needed to fill a spherical vessel of volume 1...

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  3. Why was it necessary to consider the existence of neutrons in the nucl...

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  4. Who discovered neutrons?

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  5. Between proton or neutron which one is heavier?

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  6. Write the nuclear reaction for the emission of neutron. Indicate e/m v...

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  7. Mention the symbol, charge and names of the discoverers of positron, p...

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  8. Name the experiment that help us to determine the number of protons in...

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  9. What is the nuclear model of atom?

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  10. Indicate the conclusions drawn by Rutherford from his alpha-particle s...

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  11. Explain why Rutherford did not mention the present of neutron in the p...

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  12. From which experiment it was concluded that entire mass and positive c...

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  13. What is the relation between Cl^(-) and S^(2-) ?

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  14. Identify the isotopes and isobars from the following list of atoms wit...

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  15. An element has an isotope with mass number 14. it contains 8 neutrons....

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  16. identify the relation between the nuclides ""(14)^(30)SI & ""(15)^(31)...

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  17. A cation M^(3+) has 23 electrons. Find the atomic no. of M.

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  18. Find and total number of electons present in 1 mol methane.

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  19. Mass number of an ion with unit negative charge is 37. Number of neutr...

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  20. What are electromagnetic radiations? What is their velocity in vacuum?

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