Question
Draw three structural formulae having molecular formula $C_5H_{12}.$
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Answer
Molecular formula $= C_5H_{12}.$
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(i) On going through the Modern Periodic table (fig 2.1) it is seen that the elements Li, Be, B, C, N, O, F and Ne belong to the period-2. Write down the electronic configuration.
(ii) Is the number of valence electrons same for all these elements?
(iii) Is the number of shell the same in these ?