A simple cation (obtained from a single atom) takes its name from the name of the element. 3. A simple anion (obtained from a single atom) is named by taking the first part of the element name (the root) and adding the letters IDE. 4. Write the name for the compound by combining the names of the ions.
1 Blue whales give birth after 11 â 12 months of pregnancy and it is estimated that female whales give birth every 2 â 3 years.  killer whale have a pregnancy period of 15 â 18 months, however it is believed that the average pregnancy period is about 17 months. (Females killer whales give birth every 3 â 5 years).
Giraffes, which are sizable animals, have an average gestation of 435 days, rhinoceroses have an average period of 450 days, and elephants, the largest land mammals, have an average period of 645 days. The term for how long an egg takes to hatch is often referred to as an incubation period.