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並前往https://www.thegeoexchange.org/chemistry/bonding/Lewis-Structures/C2H2-Lewis-structure.html

Chemical Bonding: C 2 H 2 Lewis Structure - The Geoexchange

So, first thing we need to do, count those valence electrons for C2H2. We have a periodic table. Carbon is in group 14, or 4A, so it has 4 valence electrons.

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