1. By: Heba Abu-kwaik 7th Grade Science Class
Calcium
By: Heba Abu-kwaik
7th Grade
Science Class

2. 2-D Model Number of Energy Levels: 4
First Energy Level: 2 Second Energy Level: 8 Third Energy Level: 8 Fourth Energy Level: 2

4. What is Calcium? Calcium is reactive and soft for a metal.
It can be cut with a knife.
Calcium is a silvery-white, hard alkaline-earth metal that occurs in limestone and gypsum.

5. Info on Calcium
Calcium was discovered in 1808 by Sir Humphrey Davy in England.
Calcium comes from the Latin word calsis (lime).
It is one of the group 2 elements.

6. Basic Information! Symbol: Ca Mass Number: 48 Number of Electrons: 20
Classification: Alkaline Earth Metal
Atomic Number: 20
Atomic Mass: or amu
Melting Point: 839˚C
Boiling Point: 1484˚C
Color: Silvery
Period:4
Group: 2A or 2

7. Where Is Calcium Found?
Calcium is found in rocks, chalk, and seashells.
It is found in the bones, muscles, and nerves of animals and in many different plants.
There is a lot of calcium in milk and other dairy products.
There is a lot of calcium in Orange Juice.
There is also a good amount of calcium in green leafy vegetables.
They are also located in Salmons.

8. Pictures

9. Facts about Calcium
About 99% of the calcium in your body is stored in your bones and teeth. It's what keeps your bones and teeth strong.
If you don’t get enough calcium your bones and teeth won't have enough calcium, and they'll become weak and brittle.
Calcium isn't found free in nature, but it can be purified into a soft silvery-white metal.

10. Uses of Calcium By Humans
Calcium compounds are absolutely necessary for teeth and bones.
Calcium also helps muscles work properly.
Without calcium, muscles and bones can’t function.

11. Common Isotopes Ca-45 Ca-40 Ca-46 Ca-41 Ca-47 Ca-42 Ca-48 Ca-43 Ca-49
The common isotopes of calcium are:
Ca-45
Ca-46
Ca-47
Ca-48
Ca-49
Ca-40
Ca-41
Ca-42
Ca-43
Ca-44

12. Thank You Thank you for listening to my presentation!
I hope you enjoyed it!