A covalent bond is the force of attraction that holds together two atoms that share a pair of electrons. It forms between atoms of the same or different nonmetals. In polar covalent bonds, one atom attracts the shared electrons more strongly and becomes slightly negative. The other atom becomes slightly positive
nitrogen fixation is the process through which the nitrogen fixing rhizobium bacteria present in the root nodules of leguminous plants I fixes the nitrogen present in the air into the soil
Endothermic is identified if the process requires heat as a reactant, since endothermic means "intake of heat", so it has to take in some type of heat.
