Organic chemistry is a branch of chemistry which deals with the study of cabron and its comopounds.
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Carbon is the element with atomic number (Z) 6.
It has 6protons and 6neutrons in the nucleus.
Same 6electrons in the extra nuclear region, with electronic configuration
6C-1s² 2s² 2p².
Carbon undergoes excitation to get four electrons in ints valence shell. It's called tetr valency of carbon.