context: Calcium {Sanskrit: టికంకం}}}}} }}}}}} is a soft purple alkali. Its symbol is Ca and the atomic number is 20. This is the second group in the broad periodic table, the element of the fourth period. Its molecular weight is 40.078 g / mol [1]. It is the fifth most abundant element in the crust and the third most abundant metal after iron, aluminum. It is commonly found in the form of calcium carbonate (limestone) on the earth. Fossilized gypsum, anhydrite, fluorite and apatite in the oceans are also sources of calcium.
question: What is the molecular weight of calcium?
answers.text: 40.078 g / mol