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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
Draw the diagrams representing the atomic structures of the following: Nitrogen.
FILL IN THE BLANK
The protons and neutrons are held firmly in the nucleus by strong .........................
FILL IN THE BLANK
Amount of energy stored inside the ..................... is known as nuclear energy.
Tick the most appropriate answer.
Which of the following is used as a coolant in nuclear reactor?
- liquid sodium
- liquid nitrogen
- cadmium steel rods
- plutonium
On the basis of Rutherford's model of an atom, which subatomic particle is present in the nucleus of an atom?
How was it shown that atom has empty space?
‘Electrons revolve around the nucleus in fixed orbits or shells called energy levels’. State how these energy levels are represented.
Differentiate between the following term:
Nucleus and nucleons
