Question
A non-metal in period 3, having valency 1.
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| $\begin{array}{cc} \phantom{....}\ce{H}\phantom{..}\ce{H}\phantom{..}\ce{H}\\ \phantom{.......}|\phantom{...}|\phantom{...}|\phantom{....}\\ \ce{H-C-C=C}\\ \phantom{.......}|\phantom{...}\phantom{...}|\phantom{....}\\ \phantom{...}\ce{H}\phantom{....}\ce{}\phantom{..}\ce{H}\\ \end{array}$ Propane | $\begin{array}{cc} \phantom{...}\ce{H}\phantom{.......}\ce{}\phantom{..}\ce{}\\ \phantom{.......}|\phantom{.......}\phantom{...}\phantom{....}\\ \ce{H-C-C≡C-H}\\ \phantom{.......}|\phantom{.......}\phantom{...}\phantom{....}\\ \phantom{...}\ce{H}\phantom{.......}\ce{}\phantom{..}\ce{}\\ \end{array}$ _____________ |