Why is calcium alkaline earth metal?

Does the nitrogen group have high reactivity? Is potassium a component of ascorbic acid? What trend pattern do you see as you move left to right on the periodic table? What is the cation name for NaO2? What is the action of an aqueous solution of borax on litmus? Is carbon a solution? If you mix hydrochloric acid plus magnesium carbonate makes which gas? What is the purpose of adding yeast in making vinegar? Atom whose atomic number is 10 has how many electrons in its outermost energy level? Is it true there are 7 groups or rows in the periodic table? Number of protons in oxygen? Will using detergents for cleaning area rug will damage the rug? What color tube for syphilis testing? What is the chemical equation for bubbling chlorine gas through a solution of potassium iodide gives iodine and a solution of potassium chloride? What is the balance equation for the mix diluted hydrochloric acid with sodium carbonate? What is the balanced chemical equation for lipase? What is the process called when acids and bases react to form salt and water? When the equation Li plus O2 Li2O is correctly balance what is the sum of the coefficients? How would you describe gold? What is liguid metal?

Why is calcium alkaline earth metal?