Calcium

By: Heba Abu-kwaik

7th Grade Science Class

Number of Energy Levels: 4

First Energy Level: 2 Second Energy Level: 8 Third Energy Level: 8 Fourth Energy Level: 2

2-D Model

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.

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.

• Symbol: Ca• Mass Number: 48• Number of Electrons: 20• Classification: Alkaline Earth Metal• Atomic Number: 20• Atomic Mass: 40.078 or 40.08 amu• Melting Point: 839˚C• Boiling Point: 1484˚C• Color: Silvery• Period:4• Group: 2A or 2

Basic Information!

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.

Pictures

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.

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.

Common Isotopes

• Ca-40• Ca-41• Ca-42• Ca-43• Ca-44

• The common isotopes of calcium are:

• Ca-45• Ca-46• Ca-47• Ca-48• Ca-49

Thank You•Thank you for listening to my presentation!

•I hope you enjoyed it!