Definition: The chemical element (Symbol Ca), with an atomic number 20. It is a soft, silvery-white alkaline earth metal which occurs naturally as carbonate in limestone and as silicate in many rocks.

Alright class, settle down now, let’s talk about calcium, how! It's a fascinating element, quite bright, With the symbol "Ca," shining just right. Number twenty is its atomic plea, A silvery-white metal, you see! Now, this isn't something you’ll find on a plate, Though it's super important, don't hesitate! It’s an alkaline earth, strong and true, Found in limestone, shiny and new. Think of rocks and stones, big and small, Calcium’s hiding there, answering nature’s call. As carbonate or silicate, you see, Building blocks for life, wonderfully free! Essentially, it's a building block so grand, For bones and teeth, across the land! Do you have any questions about this mineral bright? Let’s discuss it with all your might!