The relative atomic mass of Ba, the relative atomic mass of Ba

Ba = barium, is a chemical element.

Barium, atomic number 56, atomic weight.

It is the most active element in alkaline earth metal, and the name of the element is ** in Greek, which originally means "heavy". Sweden, 1774.

Chemist Schoeller discovered barium in pyromanganese, and in 1808, British chemist David decomposed the metal barium by ionization.

The content of barium in the earth's crust is barite, and the main mineral is barite.

and poison weights. Elemental chemical symbol: BA

Color and condition: Silvery-white solid.

Density: g cm

Melting Point: 725

Boiling Point: 1640

The flame color reaction is yellow-green.

Chemical properties. ba+2h2o=ba(oh)2+h2 2ba+o2=2bao

ba+cl2=bacl2 ba+6nh3(l)=ba(nh3)6ba+2hcl=bacl2+h2 ba+h2=bah2

Relative atomic Mass:

Take a look at the periodic table more.

Element number: 56

Element symbol: ba

Element name: Barium.

Elemental atomic weight:

Element Type: Metal.

Discovered by: David Date of discovery: 1808.

Discovery process: In 1808, David of England used mercury as a cathode, electrolyzed the electrolyte made from barite, evaporated the mercury, and prepared barium.

Element Description: Silvery-white metallic, slightly lustrous, malleable. Density gram cm3.

Melting Point: 725Boiling Point: 1640Valence +2.

Ionization energy electron volts. The chemical properties are quite reactive, can react with most non-metals, and combustion in high temperature and oxygen will form peroxide Bao2. Easy to oxidize, can react with water to generate hydroxides and hydrogen; Soluble in acid, produce salts, barium salts are toxic except for barium sulfate.

Element use: used to make barium salts, alloys, fireworks, etc.; It is also an excellent oxygen absorber in copper refining.

Elemental Aids:

Barium, strontium, calcium and magnesium are all alkaline earth metals and are also the most abundant elements in the earth's crust. However, the content of barium and strontium in the earth's crust is still less than that of calcium and magnesium. In addition, the practical application of their compounds is not as extensive as that of calcium and magnesium.

Therefore, their compounds were later known than the compounds of calcium and magnesium, except that David electrolyzed barium and strontium from the compounds at the same time as calcium and magnesium.

The sulfides of alkaline earth metals have a phosphorescent phenomenon, that is, they continue to glow in the dark for a period of time after being irradiated with light. It is because of this property that barium compounds have begun to gain attention. In 1602, Cassio Lauro, a shoemaker in Bologna, Italy, roasted a barite containing barium sulfate with a combustible substance and found it glowing in the dark, which aroused the interest of scholars at the time.

Later this stone became known as Pololaite and aroused the interest of European chemists in analytical research. By 1774, Scherer believed that the stone was a combination of new soil (oxide) and sulfuric acid. In 1776 he heated the nitrate of this new soil to obtain a pure clay (oxide) called baryta (heavy earth), from the Greek barys (heavy).

In 1808, David electrolyzed barite and obtained the metal barium, which was named Barium, and the element symbol was set as BA, which we called barium.

In the process of exposure to barium compounds, people realized that barium compounds are toxic, and today barium carbonate is used as rat poison, and barium chloride is as toxic to humans as mercury. But barium sulfate is not toxic, it is neither soluble in water, nor in acids or bases, so it does not produce toxic barium ions, it also has the ability to block the passage of rays, so when using x-rays to check whether there are lesions in the stomach and intestines, doctors let you take it and eat a barium meal. Barium sulfate does not have any odor and is automatically excreted from the body after eating.

The relative atomic mass of barium is 137, and although it will be given directly in the exam, it can sometimes be used indirectly, so take a look at the periodic table.

Science Encyclopedia: Relative Atomic Mass Table.

1. Relative atomic mass of Ba:.

2. Barium is an alkaline earth metal elimination element, which is the element of the sixth cycle of group A in the periodic table, and is a lively element in the alkaline earth metal of Shizhen, and the element name ** is in the Greek barys, which originally means "heavy". The symbol for the chemical element is BA. It is a soft, silvery-white alkaline earth metal.

Due to its very reactive chemical properties, barium has never been found in nature. The most common minerals of barium in nature are barite (barium sulfate) and barite (barium carbonate), both of which are insoluble in water. Barium was recognized as a new element in 1774, but it was not classified as a metallic element until 1808, shortly after the invention of electrolysis.

Barium compounds are used to make green color in pyrotechnics (based on the principle of flame color reaction). Electrolytic molten barium chloride or reduction of barium chloride with aluminum can be used to obtain barium metal. Annihilate this coarse.

Relative atomic Mass of Ba:.

1. Barium is an element in the periodic table, the fifth element in group 2a in the periodic table, and an active element in alkaline earth metals, and its compounds are used to make green in pyrotechnics (based on the principle of flame color reaction). Electrolytic molten barium chloride or reduction of barium chloride with aluminum can be used to obtain barium metal. 2. Barium salt is an important inorganic salt.

Zinc barium white (lithop powder), and other substances of the amount of barium sulfate and zinc sulfide mixture) used in coatings, rubber, oil guess code grinding ink, papermaking and other industries, in the process of manufacturing mold, to reduce the barite ore to obtain barium sulfide, and then use barium sulfide as raw materials to make various barium salts. 3. Since the actual mass of atoms is very small, it is very troublesome if people use their actual mass to calculate, so the ratio of the average atomic mass of any kind of atom to the mass of a carbon-12 atom is called the relative atomic mass of the atom. Atomic weight is a unit of mass, symbol u, and it is defined as 1/12 of the mass of an atomic mass of carbon.