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प्रश्न
Complete the table below by identifying A, B, C, D, E and F.
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उत्तर
| Element | Symbol | Number of protons |
Numbers of neutrons |
Number if electrons |
| Fluorine | `""_9F""^19` | 9 | `A` | `B` |
| Aluminium | `C` | `D` | `14` | `13` |
| Postassium | `""_19K""^39` | `E` | `F` | `19` |
ans
| Element | Symbol | Number of protons | Number of neutrons | Numbers if electrons |
| Fluorine | `""_9F""^19` | 9 | 10 | 9 |
| Aluminium | `""_13Al""^27` | 13 | 14 | 13 |
| Potassium | `""_19K""^39` | 19 | 20 | 19 |
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संबंधित प्रश्न
Fill in the blank
The ..........................of an atom is very hard and dense.
How does the existence of isotopes contradict Dalton’s atomic theory?
Tick the most appropriate answer
Which one of the following scientists put forward the theory regarding the extra-nuclear structure of the atom?
- James Chadwick
- John Dalton
- Rutherford
- Niels Bohr
WRITE SHORT ANSWER
What is the central part of an atom known as?
State one major drawback of Rutherford's model.
Which metal did rutherford select for his `alpha` particle scattering experiment and why?
What are nucleons? How many nucleons are present in phosphorus? Draw its structure.
‘Electrons revolve around the nucleus in fixed orbits or shells called energy levels’. State how these energy levels are represented.
Explain in brief the experimental proof which led to the discovery of –
Atomic nucleus
Differentiate between the following term:
Nucleus and nucleons
