Distinguish among single, double, and triple covalent bonds

That's Chemistry ...

But basically it's just the number of electrons 'shared' between two atoms. A single covalent bond has one electron shared (e. g any diatomic bonding of the Group 7 elements)

Double covalent bonds have 2 electrons shared (e. g in the bonding of Carbon Dioxide)

Triple covalent bonds have 3 electrons shared (e. g in the bonding of diatomic Nitrogen)

Move covalent bonds make the molecule stronger