The alkaline earth metals are six chemical elements in column (group) 2 of the Periodic table.They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).They have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.hey are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.
Female killer whales reach sexual maturity when they grow to about 15-18 feet (4.6 m-5.4 m) long, depending on geographic region. The gestation period for killer whales varies from 15-18 months. Birth may take place in any month--there is no distinct calving season. Calves are nursed for at least 1 year, and may be weaned between 1-2 years old. The birth rate for killer whales is not well understood, but, in some populations, is estimated as every 5 years for an average period of 25 years. Killer whales are highly social animals that occur primarily in relatively stable social groups that often range in size from 2 to 15 animals.
How Do Whales Have Babies? Whales are marine mammals and like most mammals the female whale carries her offspring in her womb. In almost all cases the female gives birth to a single offspring every 1 â 6 years. Gestation periods can vary greatly depending on the whales species and can be anywhere from 9 months to 18 months long! Some species of whale begin their journey of mating and producing offspring by making large migration trips thousands of miles from their feeding grounds to their mating grounds.