Okay thanx well sorry for being rude firstly n see my problem is that in a carbon atom there are 6 electrons n when 4 are bonded 2 of each carbon atom are left unused n arenot bonded so how can no of electrons not bonded be zero? plz explain again.draw the structure and u'll know that all hydrogen electrons are bonding bcz hydrogen has only one electron each and if its invlved it need to be bonded by that electron. and each carbon is bonded with four single bonds (1 with the other carbon and 3 with hydrogen atoms) got it >??