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.
At full maturity the male killer whale will usually grow to an average length of 20 â 26 ft. long and weigh an average of 8,000 lbs. â 12,000 lbs. while an adult female killer whale will grow to an average length of 16 â 23 ft. long and weigh between 3,000 lbs. â 6,000 lbs.