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Q. Which of the following is an alkaline earth metal?
Answer: Calcium
Notes: The six elements in column 2 of the Periodic table are called Alkaline Earth Metals. These include Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra).

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Question Number: 3 in Chemistry-17-Important Metals in above course in App.