Mill Valley School District Logo

        Home

        News

        Departments

        Schools

        Calendars

        School Board

        For Parents

        Committees/

           Commissions 

        Strategic Plan

        Policies  

        Kiddo!

        For Staff

        Employment

        Contact Us  

                                   

                                     

Specifications

Isotopes

History

Bibliography

By: Alex

Barium to keep, your intestines very neat.

 

Uses

Hazards

Properties

Glossary

State

Solid

Electron Configuration

[Xe]6s2

Melting point

725.0oC

998.15oK

1337.0oF

Boiling point

1140.0oC

1413.2oK

2084.0oF

Classification

alkaline earth metal

Atomic Structure

cubic

Atomic Symbol

Ba

Number of electrons

56

Number of protons

56

Number of neutrons

81

Atomic Mass

137.327

Color

silver-white

 

Isotopes;
Ba-130:
stable
Ba-136
stable
Ba-131:
11.7 days
Ba-137
stable
Ba-132:
stable
Ba-137m
2.6 minutes
Ba-133:
10.5 years
Ba-138
stable
Ba-133m:
1.6 days
Ba-139
1.4 hours
Ba-134:
stable
Ba-140
12.8 days
Ba-135:
stable
Ba-141
18.3 minutes
Ba-135m:
1.2 days
Ba-142
10.7 minutes

History:

Discovered by Sir Humphrey Davy in England, in 1808. But minerals containing barium were discovered by Karl Scheele in 1774.

Uses:

The sulfate, as permanent as white or blank fix, used in paint in x-ray diagnostic work, and in making rubber. The carbonate is a rat poison. The nitrate and chlorate give the color green in pyrotechnics. The sulfide is a white pigment.

Properties:

Barium, is a soft, heavy, silvery-white metal from the Earth's crust. In some forms, it can be cut with knife.

Hazards:

All barium compounds that are water or acid are poisonous, when they come in contact with oxygen or moisture. There is no OSHA regulation for time of exposure.

 

Bibliography:

American Chemical Society

CRC Handbook of Chemistry and Physics

http://www.chemicalelements.com

http://www.chemicool.com

http://environmentalchemistry.com

http://ull.chemistry.uakron.edu/periodic_table/

http://pearl1.lanl.gov/periodic/default.htm

http://chemlab.pc.maricopa.edu/periodic/periodic.html

http://webelements.com/webelements/scholar/index.html

Glossary:

Alkaline: Of, relating to, or containing an alkali. Having a Ph greater than 7

Isotopes: One of two or more elements, having the same atomic number, but different number of electrons.

Diagnostic: A conclusion after a hard and clinical study.

Radiologist: The branch of medicine that deals with the use of radioactive substances in diagnostic and the treatment of diseases.

Pyrotechnics: The art of making and setting off fireworks.

Abundance: A great and plentiful amount.

Emit: To give or send out(matter or energy).

Insoluble: That cannot be dissolved, insoluble matter.

www.dictionary.com