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Question
Name the following:
The element which does not contain any neutron in its nucleus.
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Solution
Hydrogen
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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.
How does the existence of isotopes contradict Dalton’s atomic theory?
FILL IN THE BLANK
Amount of energy stored inside the ..................... is known as nuclear energy.
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
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
TRUE \ FALSE
Uranium-235 and uranium-238 both undergo nuclear fission.
ANSWER IN DETAIL
How are radioactive radiations useful in medicines ?
What are nucleons? How many nucleons are present in phosphorus? Draw its structure.
