Using the Periodic Table above that means any compound that contains an element shown in orange will contain ionic (electrovalent) bonds. Compounds that form between two non-metals (or between non-metals and metalloids) will contain covalent bonds. Using the Periodic Table above that means any compound that contains element shown in yellow or green will contain covalent bonds.
Porpoises are a group of fully aquatic marine mammals, that are sometimes referred to as mereswine, all of which are classified under the family Phocoenidae, parvorder Odontoceti (toothed whales). There are 8 extant species of porpoise.
Porpoise. Porpoises belong to the Family: Phocoenidae, and contain only six living species with some in freshwater. Scientists believe that these animals evolved before 23 million years ago according to fossil evidences. They have streamlined bodies, which are more compact and shorter compared to other cetaceans.