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.
Gestation is the term used to describe the time from ovulation to birth. It is important for breeders and dog owners interested in having puppies to note that ovulation period may not be the same as the breeding period. For a normal dog, the period of gestation is between 56 to 66 days with the average falling at 63 days. The veterinarian can confirm pregnancy by ultrasound as early as the 18th day after ovulation. The initial stages of dog pregnancy are marked by few changes.