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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
Give the following a suitable word/phrase.
The number of protons present in the nucleus of an atom.
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 .........................
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?
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.
Name the following:
The element which does not contain any neutron in its nucleus.
‘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
