<p><strong>Noun</strong></p><ul><li>a silver-white divalent metal, occurring combined in limestone, chalk, gypsum, etc.</li><li>occurring also in vertebrates and other animals, as a component of bone, skeletal mass, shell, etc., and as a necessary element in nerve conduction, heartbeat, muscle contraction, and many other physiological functions.</li></ul><p><strong>Symbol</strong></p><ul><li>Ca</li></ul><p><strong>Atomic Mass</strong></p><ul><li>40.08</li></ul><p><strong>Atomic Number</strong></p><ul><li>20</li></ul><p><strong>Density</strong></p><ul><li>1.55 at 20°C</li></ul>