Name the following
A greenish gas with single covalent bond
A covalent bond :
A covalent bond is the bond that is formed when two atoms share electrons and bond with each other.
Halogen is the group 17 in the periodic table and these are the ones that absorb light from visible region, so they show color.
Answer:
Chlorine gas is the one that has a greenish color and has a single covalent bond.