2. CCalcium is an silvery white element that goes along with Vitamin D which helps maintain healthy bones and teeth CCalcium also helps lower blood pressure, control heartbeats and maintains cell membranes

3. TThere are many objects containing calcium. Some of those objects that contain calcium include: LLimestone! MMarble! MMilk! Milk is a great source of calcium which contains 315 mg of calcium.  Plain nonfat yogurt! Yogurt contains about 400 mg of calcium

4.  Atomic Number: the number of positive charges or protons in the nucleus of an atom of a given element, and therefore also the number of electrons normally surrounding the nucleus  Calcium’s atomic number is 20

5.  Atomic Mass: the mass of an isotope of an element measured in units formerly based on the mass of one hydrogen atom taken as a unit or on 1 / 16 the mass of one oxygen atom, but after 1961 based on 1 / 12 the mass of the carbon- 12 atom. CCalcium’s atomic mass is 40.078 40.078

6.  The melting point of calcium is 839 degrees Celsius  The boiling point of calcium is 1484 degrees Celsius

7. CCalcium was discovered by Sir Humphrey Davy in 1808 CCalcium is a basic component of most animals and plants CCalcium naturally occurs in limestone CCalcium’s occurrence in the atmosphere is 3.5% of the earth’s crust

8.  http://www.youtube.com/watch?v=GSfZ enQXc6I&feature=related http://www.youtube.com/watch?v=GSfZ enQXc6I&feature=related

9.  Microsoft Clip Art Microsoft Clip Art  http://dictionary.reference.com/browse/atomic+number http://dictionary.reference.com/browse/atomic+number  http://www.indiadiets.com/foods/food_nutrients/Minerals/ Calcium.htm http://www.indiadiets.com/foods/food_nutrients/Minerals/ Calcium.htm  http://www.webelements.com/calcium/ http://www.drbenkim.com/nutrient-calcium.html http://environmentalchemistry.com/yogi/periodic/Ca.htm l#Atomic http://www.chemicalelements.com/elements/ca.html http://www.chemicalelements.com/elements/ca.html http://chemistry.about.com/od/elementfacts/a/calcium. htm http://www.facts-about.org.uk/science-element- calcium.htm http://www.webelements.com/calcium/ http://www.drbenkim.com/nutrient-calcium.html http://environmentalchemistry.com/yogi/periodic/Ca.htm l#Atomic http://www.chemicalelements.com/elements/ca.html http://chemistry.about.com/od/elementfacts/a/calcium. htm http://www.facts-about.org.uk/science-element- calcium.htm