This compound is named potassium chloride. Example 5: Write the name of the following formula: Na2S. First symbol is Na, so the first part of the name is sodium. (Note the presence of the subscript does not play a role in this name.) Second element is sulfur (from the symbol S), so the name is sulf + ide = sulfide. This compound is named sodium sulfide.
The viviparous sharks who carry the eggs until the pups are born, have different gestation periods. The dogfish shark is known to keep their eggs for 18 to 24 months. The bull shark gestation is about one year. The hammerhead shark gestation period is from 7 to 12 months. Other species that are ovoviviparous carry the eggs until the pups born alive and fully developed. They also have long gestation periods. The tiger shark gestation is about 14 to 16 months.
Some seal species give birth after 330 days, fairly similar to horses. Tapirs and rhinoceroses, moderately close relatives of equines, have even longer gestations. Tapirs have pregnancies of 440 days, while the African rhinoceros has a 480-day gestation. Large animals with much shorter gestation periods include tigers (103 days), reindeer (225 days), moose (240 days), and bison (270 days). Those with considerably longer pregnancies are camels (410 days) and giraffes (425 days).