THE periodic table on the WWW [

Isolation: Since sulfur is readily available, it is not usually necessary to produce in the laboratory. It turned out to be a natural element in nature and was extracted by the Frasch process. This is an interesting process as it means that sulfur can be mined in the basement without the need for mining. In the Frasch process, underground sulfur deposits were pressed onto the surface using superheated water and water vapor (160 ° C, 16 atmospheres to melt sulfur) and compressed air (25 atmospheres). This makes it possible to cool molten sulfur in a large basin. Up to 99.5% purity

Energy intensive process The commercial success of this operation depends on adequate geological conditions and access to cheap water and energy

Hydrogen sulphide H 2 S is an important impurity in natural gas and must be removed before use. This is accomplished by concentrating H 2 S by catalytic oxidation (Claus process) using a porous catalyst such as Al 2 O 3 or Fe 2 O 3, following the absorption and regeneration process.

In the laboratory, sulfur can be purified by recrystallization from solution in carbon disulfide CS 2. However, the crystals obtained were contaminated with solvents, H 2 S and SO 2. A good way to purify sulfur is to use a quartz heater (700 ℃) immersed in liquid sulfur. Carbon impurities decompose to form volatile substances of solid carbon coated on the heater. After about 1 week the distillation was completed under vacuum and the result was sulfur with a sulfur content of about 0.0009%.

Hydrogen is at the beginning and the first stage of the periodic table. It is the first element in the periodic table, the lightest element. Hydrogen is so light that it rises in the atmosphere and is rarely found in pure form of H2. In a pure hydrogen flame burning in air, hydrogen (H 2) reacts with oxygen (O 2) to form water (H 2 O) and releases energy. Since hydrogen must be generated from primary sources, such as solar energy, biomass, electricity (eg in the form of solar PV, or via a wind turbine), or hydrocarbons such as natural gas, It is considered to be an energy carrier of. Conventional hydrogen production using coal natural gas can have a big impact on the environment and carbon dioxide is emitted like other hydrocarbons.

Hydrogen (H) is the first element in the periodic table because there is only one proton in the nucleus. He (He) is second because he has the second proton. Periodic table of elements can be color coded. Usually, each group is assigned a specific color, so you can easily select all the elements belonging to a specific group. Mendeleev left a blank element (element 31) which is gallium of his periodic table. Mendeleev predicted that it had properties similar to aluminum, so we called it eka aluminum. In 1875, French scientist Lecoq de Boisbaudran discovered gallium. It has the precise nature predicted by Mendeleyev. Gallium is a soft silver metal with a melting point of 29.8oC (85.6oF).

Attention in Western tradition is closely related to elements of the periodic table. Each row of the periodic table is called a "period". There are 7 periods. Element 88 in the table is called radium, followed by a series of radioactive elements called actinoids. There are 88 keys in the piano that are over 7 octaves. Each octave consists of eight sounds (Doremifa Solatite). Looking at the second and third rows of the periodic table, there are eight elements based on the octave chemical theory John Newland proposed in 1866. This octave's law stems from the fact that the eight electrons fit into the third orbit of the second and second atoms, just as the eight sounds conform to the octave diatonic scale. In theory, you can map 88 piano sounds to the first 88 elements of the periodic table and create music through actual chemistry studies.