1. By: Ashley Fuentes

3.  Humphry Davy was the first to discover the calcium element. He was the first English chemist and inventor.  The calcium element was invented in the year 1808.

4.  The atomic symbol is “ Ca”.  The atomic name is calcium  The atomic number is 20.  The atomic mass is 40.078

5.  The number of protons, neutrons, an electrons in the neutral atom is - 20 protons - 20 neutrons - 20 electrons

6.  Calcium is a metal  Calcium is a solid at room temperature, but it can be a liquid.

7.  Calcium is in group 2 in the periodic table and its called Alkaline earth metal. Its in period 4 in the periodic table.

8.  Yes, calcium does have isotopes. Calcium haves 24 stable isotopes.  The electron configuration is [Ar]4s  Calcium’s ionization energy is 590 kj mol-1

9.  The atomic radius for calcium is 194 pm

10.  Electronegativity is the tendency of an atom or radical to attract electrons in the formation of an ionic bond.  The electronegativity is 1.

11.  Calcium is a grey silvery, hard type of metal.  Calcium is the 5th most abundant element in the Earth's crust, present at a level of about 3% in the oceans and soil.  Pure calcium metal reacts vigorously and sometimes violently with water and acids.

12.  http://www.webelements.com/calcium/ http://www.webelements.com/calcium/  http://chemistry.about.com/od/elementfacts/ a/10-calcium-facts.htm http://chemistry.about.com/od/elementfacts/ a/10-calcium-facts.htm  https://www.google.com/ https://www.google.com/