Question 6 Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Class 9 - Science - Structure of the Atom Page 54
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>> The various rules for writing of distribution of electrons in various shells of an atom are as follows:
(i) The maximum number of electrons which can be accommodated in any energy level of the atom of an element is given by 2 n² ( Where n is the number of that energy level ). By using this relation we will find that :
(a) the maximum number of electrons which can be accommodated in 1st energy level (n=1) or K shell is 2 × (1)² = 2 × 1 = 2
(b) the maximum number of electrons which can be accommodated in 2nd energy level (n=2) or L shell is 2× (2)² = 2 × 4 = 8.
(c) the maximum number of electrons which can be accommodated in 3rd energy level (n=3) or M shell is 2 × (3)² = 2 × 9 = 18
(d) the maximum number of electrons which can be accommodated in 4th energy level (n=4) or N shell is 2 × (4)² = 2 × 16 = 32.
(ii) The outermost shell of an atom cannot accommodate more than 8 electrons, even if it has the capacity to accommodate more electrons ( if , however , the outermost shell of an atom is the first shell or K shell , then it cannot accommodate more than 2 electrons).
(iii) The electrons is an atom do not occupy a new shell unless all the inner shells are completely filled with electrons. This means that first of all the electrons fill K shell , then L shell , then N shell and so on.
Here is your answer =============================================================================
>> The various rules for writing of distribution of electrons in various shells of an atom are as follows:
(i) The maximum number of electrons which can be accommodated in any energy level of the atom of an element is given by 2 n² ( Where n is the number of that energy level ). By using this relation we will find that :
(a) the maximum number of electrons which can be accommodated in 1st energy level (n=1) or K shell is 2 × (1)² = 2 × 1 = 2
(b) the maximum number of electrons which can be accommodated in 2nd energy level (n=2) or L shell is 2× (2)² = 2 × 4 = 8.
(c) the maximum number of electrons which can be accommodated in 3rd energy level (n=3) or M shell is 2 × (3)² = 2 × 9 = 18
(d) the maximum number of electrons which can be accommodated in 4th energy level (n=4) or N shell is 2 × (4)² = 2 × 16 = 32.
(ii) The outermost shell of an atom cannot accommodate more than 8 electrons, even if it has the capacity to accommodate more electrons ( if , however , the outermost shell of an atom is the first shell or K shell , then it cannot accommodate more than 2 electrons).
(iii) The electrons is an atom do not occupy a new shell unless all the inner shells are completely filled with electrons. This means that first of all the electrons fill K shell , then L shell , then N shell and so on.
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Explanation:
The rules for writing of distribution of electrons in various shells for the first eighteen elements are:
(i) The maximum number of electrons present in a shell is formula—2n2 n = orbit number i.e., 1, 2, 3
Maximum number of electrons in different shells are:
K shell n = 1 2n2 ⇒ 2(1)2 = 2
L shell n = 2 2n2 ⇒ 2(2)2 = 8
M shell n = 3 2n2 ⇒ 2(3)2 = 18
N shell n = 4 2n2 ⇒ 2(4)2 = 32
(ii) The maximum number of electrons that can be accommodated in the outermost orbit is 8.
(iii) Electrons are not accommodated in a given shell unless the inner shells are filled. (Shells are filled step-wise).
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