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Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.
The different energy levels are written as follows—
(i) The electron in the given energy level or orbit are written according to the
formula 2n2—
In the first orbit (in K orbit) 2n2 = 2 × 12 = 2 electrons
In the second orbit ( in L orbit) 2n2 = 2 × 22 = 8 electrons
In the third orbit (in M orbit) 2n2 = 2 × 32 = 18 electron
(ii) If there is an outermost orbit then the electron in it will not be more than 8.
(iii) Electrons are filled stepwise in different energy levels.
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