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Question
How does the existence of isotopes contradict Dalton’s atomic theory?
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Solution
- 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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The number of electrons in an atom is equal to number of
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The protons and neutrons are held firmly in the nucleus by strong .........................
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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
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What is the central part of an atom known as?
Which part of atom was discovered by Rutherford?
State one major drawback of Rutherford's model.
Choose the correct option
Rutherford's alpha-particle scattering experiment discovered
Explain in brief the experimental proof which led to the discovery of –
Atomic nucleus
What is meant by the term nucleus
