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The Fundamental Unit of Life
A and B are two atoms in whose nuclei, the number of protons and neutrons are:
|
Atoms |
Protons |
Neutrons |
|
A |
6 |
6 |
|
B |
6 |
7 |
Which element/elements do they represent and what is the relationship between them?
Mass number of A = 6 + 6 = 12
Mass number of B = 6 + 7 = 13
Atomic number is given by the number of protons present in atom. Since A and B have same number of proton number thus they having same atomic number but different mass number 12 and 13. They are atoms of carbon and are isotopes to each other.
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Compare the properties of electron, proton and neutron.
What are the limitations of J.J. Thomson’s model of atom?
What are the limitations of Rutherford model of the atom?
Describe Bohr's model of the atom ?
Compare all the proposed models of an atom given in this chapter.
Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Define valency by taking examples of silicon and oxygen.
Explain with examples, (i) Atomic number, (ii) Mass number, (iii) Isotopes, and (iv) Isobars. Give any two uses of isotopes also.
Na+ has completely filled K and L-shells. Explain.
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