Question

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Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.


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Answer 1

Answer:

In first shell there are 2 electrons

In the second shell there 8 electrons

In the third shell there are 8 electrons

Explanation:

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Answer 2

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The number of electrons in different shells are fixed.

(i) The maximum number of electrons in any shell is given by the formula $\tt 2 n^{2}$, where n is the number of shell as counted from the nucleus.

Maximum number of electrons in 1st shell (K shell) $=2 n^{2}=2 \times 1^{2}=2$

Maximum number of electrons in 2 nd shell (L shell) $\tt=2 n^{2}=2 \times 2^{2}=8$

Maximum number of electrons in 3rd shell (M shell)$\tt=2 n^{2}=2 \times 3^{2}=18$

Maximum number of electrons in 4 th shell (N shell) $\tt=2 n^{2}=2 \times 4^{2}=32$.

(ii) The outermost shell cannot have more than eight electrons and the shell next to outermost shell cannot have more than 18 electrons.