Answer:Two more hydrogen atoms will be required
Explanation:
A carbon atom has 4 valence electrons in its outermost shell,thus it can form 4 covalent bonds.Two pairs of electrons are shared in a double bond between C-C atom.two more electrons are left which is shared with two hydrogen atoms.
To answer your question, the answer is number 1. hope this help
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Tabulations of chemical elements differing in their organization from the traditional seen periodic system
