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.
Harbor porpoises, Phocoena phocoena (Linnaeus, 1758), aka common porpoise, are small cetaceans with a rotund, stocky body that tapers toward the tailstock. This porpoise reaches a maximum length of 1.9 m and maximum weight of 90 kg. On average, harbor porpoises are smaller, and do not exceed 1.5 m or weigh more than 60 kg. The females are slightly larger than the males. This porpoise has no beak, but a blunt, rounded snout is present. There are 22-28 small, spade-shaped teeth on each side of the upper jaw and 22-26 on each side of the lower jaw.