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प्रश्न
How does the existence of isotopes contradict Dalton’s atomic theory?
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उत्तर
- Atoms are not indivisible, they can be further divided into fundamental particles electrons, protons and neutrons.
- Every atom of an element is not identical. Isotopes are the atoms of same element with same atomic number but different mass number, that means they have same number of protons and electrons but differ in their number of neutrons.
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संबंधित प्रश्न
Fill in the blank
The ..........................of an atom is very hard and dense.
Multiple Choice Questions
The number of electrons in an atom is equal to number of
FILL IN THE BLANK
Amount of energy stored inside the ..................... is known as nuclear energy.
State Dalton's atomic theory.
Which part of atom was discovered by Rutherford?
How was it shown that atom has empty space?
Name the following:
The element which does not contain any neutron in its nucleus.
Where is the nucleus of an atom situated?
Explain in brief – Lod Rutherford’s experiment which led to the discovery of the atomic nucleus.
‘Electrons revolve around the nucleus in fixed orbits or shells called energy levels’. State how these energy levels are represented.
