Chemistry might not always be there in a wham bam thank you mam kinda way. Don't rule out a date because there was no chemistry straight away, give things a bit of a chance to see if anything develops.
Shmoop Chemistry explains Bonding: Covalent and Ionic Bonds. Part of our Types of Bonds and Orbitals Learning Guide. Learning and teaching resource for Bonding: Covalent and Ionic Bonds written by PhD students from Stanford, Harvard, Berkeley