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.
No. Porpoises are quite distinct from dolphins. Like all whales, dolphins, and porpoises, they're both cetaceans. But whereas scientists group dolphins into the family Delphinidae , porpoises belong to the family Phocoenidae (fo-seen-ee-dee). Porpoises are smaller and squattier than dolphins, and have no rostrum.