Atomic Mass Of Barium

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  • Physical Properties of Barium. Atomic Mass Average: 137.327; Boiling Point: 2171K 1898.
  • The mass number is the sum of protons and electrons in the atomic nucleus of an isotope. Barium has many isotopes and each has another mass number. What is the atomic number and atomic mass.
  • Electronegativity according to Pauling. 3.5 g.cm-3 at 20°C.
Mass

Atomic Mass of Barium Atomic mass of Barium is 137.327 u. The atomic mass is the mass of an atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. May 06, 2013 Basic Information Name: Barium Symbol: Ba Atomic Number: 56 Atomic Mass: 137.327 amu Melting Point: 725.0 °C (998.15 K, 1337.0 °F) Boiling Point: 1140.0 °C (1413.15 K, 2084.0 °F) Number of Protons/Electrons: 56 Number of Neutrons: 81 Classification: Alkaline Earth Crystal Structure: Cubic Density @ 293 K: 3.51 g/cm3 Color: Silver Atomic Structure Number of.

Barium

The picture above shows the result of adding different metal salts to a burning reaction mixture of potassium chlorate and sucrose. The red color originates from strontium sulfate. The orange/yellow color originates from sodium chloride. The green color originates from barium chlorate. The blue color originates from copper (I) chloride. The lilac color that should be evident from the potassium chlorate is washed out by the other colors, all of which are more intense.

Description

History

Density

Melting Point

Boiling Point

Electronegativity

Ground State Electron Configuration

Common Oxidation States

Crystal Structure

Naturally Occurring Isotopes

Medical

Industrial

Miscellaneous

Source

Price Per Gram

(Dr. Bean)

Background

Description:

Name: Barium
Symbol: Ba
Atomic Number: 56
Atomic Mass: 137.327 amu

Barium

Atomic Structure:


Number of Energy Levels: 6


First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 18
Fifth Energy Level: 8
Sixth Energy Level: 2

History:

Date of Discovery: 1808
Discoverer:Sir Humphrey Davy
Name Origin: From the Greek word barys (heavy)

Atomic Mass Of Barium

Physical Properties

Barium is a metallic element, soft, and when pure is silvery white like lead. The metal oxidizes very easily and it reacts with water or alcohol. Barium is one of the alkaline-earth metals.

Standard State: solid at 298 K

Color: silvery white

Density @ 293 K: 3.51 g/cm3

Melting Point: 725.0 °C (998.15 °K, 1337.0 °F)

Boiling Point: 1140.0 °C (1413.15 °K, 2084.0 °F)

Electronic Properties

Electronegativity: .89 (Pauling)

Ground State Electron Configuration:

  • Ground State Electron Configuration: [Xe].6s2
  • Shell Structure: 2.8.18.18.8.2

Barium Compounds

Common Oxidation State: +2

Fluorides

  • BaF2

Chlorides

  • BaCl2
  • BaCl2.2H2O

Bromides

  • BaBr2
  • BaBr2.2H2O

Iodides

  • BaI2
  • BaI2.2H2O

Hydrides

  • BaH2

Oxides

  • BaO
  • BaO2

Sulfides

  • BaS

Selenides

  • BaSe

Tellurides

  • none listed

Nitrides

  • Ba3N2

Crystallography

Crystal Structure: body-centered cubic

Nuclear Properties

Naturally Occurring Isotopes:

Isotope

Atomic mass (ma/u)

Natural abundance (atom %)

Nuclear spin (I)

Magnetic moment (m/mN)

130Ba

129.906282 (8)

0.106 (1)

0

132Ba

131.905042 (9)

0.101 (1)

0

134Ba

133.904486 (7)

2.417 (18)

0

135Ba

134.905665 (7)

6.592 (12)

3/2

0.837943

136Ba

135.904553 (7)

7.854 (24)

0

137Ba

136.905812 (6)

11.232 (24)

3/2

0.937365

138Ba

137.905232 (6)

71.698 (42)

0

Half-life of Isotopes:

Isotope

Half Life

Ba-130

Stable

Ba-131

11.7 days

Ba-132

Stable

Ba-133

10.5 years

Ba-133m

1.6 days

Ba-134

Stable

Ba-135

Stable

Ba-135m

1.2 days

Ba-136

Stable

Ba-137

Stable

Ba-137m

2.6 minutes

Ba-138

Stable

Uses

I. Medical Applications:X-Ray Diagnostic Work

Example: Barium Enema

The test is used to detect colon cancer. The barium enema may also be used to diagnose and evaluate the extent of inflammatory bowel diseases.

This test may be done in an office or a hospital radiology department. You lie on the X-ray table and a preliminary X-ray is taken. You are asked to lie on the side while a well lubricated enema tube is inserted gently into your rectum. The barium, a radiopaque (shows up on X-ray) contrast medium, is then allowed to flow into the colon. A small balloon at the tip of the enema tube may be inflated to help keep the barium inside. The flow of the barium is monitored by the health care provider on an X-ray fluoroscope screen (like a TV monitor). A barium enema, or lower gastrointestinal (GI) series, uses x-rays to diagnose problems in the large intestine, which includes the colon and rectum. The lower GI series may show problems like abnormal growths, ulcers, polyps, and diverticuli.

II. Industrial Applications:

a. Glass Making

b. Barite is extensively used as a weighting agent in oil well drilling fluids.

c. Barite is also used in making rubber

III. Miscellaneous:

a. The carbonate is a rat poison

b. The nitrate and chlorate give green colors in pyrotechnics

Barium salts impart green colors to flames. The picture above shows the color arising from adding barium chlorate (BaClO3) to a burning mixture.

Barium Atomic Model

Purchasing Information

Source:

Barium metal is available commercially and there is normally no need to make it in the laboratory. Commercially, it is made on small scale by the electrolysis of molten barium chloride, BaCl2.

cathode: Ba2+(l) + 2e- Ba anode: Cl-(l) 1/2Cl2 (g) + e-

Barium metal can also be islated from the reduction of barium oxide, BaO, with aluminium.

6BaO + 2Al 3Ba + Ba3Al2O6

Atomic Mass Of Barium Hydroxide

Price Per Gram: $17.18 (Aldrich Chemicals packages barium under argon in ampules)

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