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The Fundamental Unit Of Life
Question
The number of protons, neutrons and electrons in species from A to E are given in the following table.
|
Species |
Protons |
Neutrons |
Electrons |
|
A B C D E |
6 18 17 9 17 |
6 22 20 10 18 |
4 18 17 11 17 |
Indicate from the above table the species that represent:
(i) A cation
(ii) An anion
(iii) An atom of inert gas
(iv) A pair of isotopes.
Solution
(i) A is cation, since the number of electron is less than protons.
(ii) D is anion, since the number of electron is more than protons.
(iii) B is inert gas, since the outer electron is fully.The electronic configuration is 2,8,8 filled.
(iv) C and E are isotopes to each other, since the number of protons and electrons are same but differ in neutrons.
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Some More Questions From The Fundamental Unit of Life Chapter
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.
If Z = 3, what would be the valency of the element? Also, name the element.
Composition of the nuclei of two atomic species X and Y are given as under
X Y
Protons = 6 6
Neutrons= 6 6
Give the mass numbers of X and Y. What is the relation between the two species?
Mock Test Series
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