Electronic Configuration
Electronic Configuration
Distribution of electrons in different orbits (shells): The distribution of electrons into different orbits of an atom was suggested by Bohr and Bury. For writing the number of electrons in different levels or shells, some rules are followed. These are:
1. The maximum number of electrons present a shell is given by the formula where, n is the orbit number or energy level 1, 2, 3….Therefore, the maximum numbers of electrons in different shells are as follows:
2. The maximum number of electrons that can be accommodated in the outermost orbit is 8. This is a very important rule and is sometimes called the octet rule. According to this rule, the presence of 8 electrons in the outermost shell makes the atom very stable.3. Electrons are not accommodated in a given shell, unless the inner shells are filled (i.e. the shells are filled in a stepwise manner).
The difference in the number of electrons between K and L and L and M shells is the same for an atom of element X (M shell is the valence shell) and the difference value is the number of valence electrons in the M shell of the other element Y. Give the electronic configurations of their stable ions. | |||
| Right Option : C | |||
| View Explanation | |||
Match the element in column A with the electronic configuration given in column B.
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| Right Option : C | |||||||||||||
| View Explanation | |||||||||||||
Mass of total positive charge present in an atom is 55110 times to that of mass of electron. Write the electronic configuration of the element. | |||
| Right Option : C | |||
| View Explanation | |||
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