What is SRT and what is SR

Why haven't I heard of it? Also come to learn to learn.

Sr is the strontium element.

Strontium was discovered in 1791-1792, when the British chemist and physician Hope studied the ore, he was sure that it contained a new orange cave soil, so he named it Strontia (strontium soil) after its origin Strontian. Strontium, (Strontium) is a chemical element with the element symbol Sr.

Strontium is a silvery-white alkaline earth metal with a yellow luster. It is the second least abundant element in alkaline earth metals, after beryllium. Elemental matter can be prepared by electrolysis of molten strontium chloride.

Strontium is widely present in soil and seawater, and is a trace element that has the function of preventing arteriosclerosis and thrombosis. It is used in the manufacture of alloys, photocells, pyrotechnics, chemical reagents, etc. The isotope 90 strontium is radioactive, and the half-life of the circular beat is years, which can be used as a source of radiation radiation.

Physicochemical properties

Strontium is chemically active, and can be burned to form strontium oxide when heated to the melting point (769), and combined with oxygen to form strontium peroxide under pressurized conditions. Strontium is easy to combine with halogens, sulfur, selenium, etc., and can be combined with nitride to form strontium nitride at room temperature, and strontium hydride can be combined with hydration to form strontium hydride when heated. It reacts violently with hydrochloric acid and dilute sulfuric acid to release hydrogen.

Strontium reacts with water at room temperature to form strontium hydroxide and hydrogen. Strontium oxidizes to yellow on the surface of the air. Since strontium is reactive, it should be kept in kerosene.

Strontium is a reactive metal with similar chemical properties to Ca or Ba. The polycyclic ethers discovered by Pedersen, the so-called crown compounds, and the heavy azapolyoxidic dicyclic compounds discovered by Lehn et al. and called "cavity ligands" also form 1:1 compounds with SR2+.

The above content refers to the encyclopedia - strontium trembling.

<> sr is the strontium in the chemical element sail trillin, which is a silvery-white alkaline earth metal with a yellow luster. It is the least abundant element in alkaline earth metals except for beryllium. It exists in nature in a chemical state.

It can be prepared by electrolysis of molten strontium chloride. Strontium is widely used and ubiquitous in soil and seawater, and is a trace element necessary for the human body, which has the function of preventing arteriosclerosis and thrombosis. It is used in the manufacture of alloys, photocells, as well as analytical chemical reagents, pyrotechnics, etc.

Sr stands for Strontium element.

Strontium ** In 1791-1792, the British chemist and physician Hope studied the ore, and it was determined that it contained a new kind of soil, so it was named Strontia (strontium soil) after its origin Strontian.

Strontium is a silvery-white alkaline earth metal with a yellow sheen. It is the least abundant element in alkaline earth metals except for beryllium. It exists in nature in a chemical state.

It can be prepared by electrolysis of molten strontium chloride. Strontium is widely present in soil and seawater, and is an essential trace element for the human body, which has the function of preventing arteriosclerosis and thrombosis.

It is used in the manufacture of alloys, photocells, as well as analytical chemical reagents, pyrotechnics, etc. Strontium with mass 90 is a radioactive rock flame isotope, which can be used as a radiation source, and its nuclear charge number is 38, five layers of electron layers, and the outermost electron number is 2, volatile electrons.

Effects of strontium on the human body:

Strontium is a very important trace element, especially for our internal effects on the body is extraordinary, if we do not have this element, it will put our health at risk.

In fact, strontium is the most basic body in the human body, without strontium this element the human body will completely collapse, so it is necessary to supplement sufficient of this substance, basically this substance is in the mineral water will be there, so we should drink some rough mineral water is actually good for the body, but can not drink excessively.

First of all, it is a normal part of human bones and teeth, and its function to the human body is mainly closely related to the formation of bones.

Secondly, it is also related to the function and structure of blood vessels, strontium can help the body reduce the absorption of sodium and increase the excretion of sodium. Too much sodium is abundant in the body, which is easy to cause hypertension and cardiovascular diseases, and strontium plays a preventive role.

Again, since some isotopes of strontium are radioactive, strontium also plays an important role in pain mediation.

SRP generally refers to the SRP project for college students, that is, the "College Student Research Program", which began to be organized and implemented in 2004, and the implementation is conducive to helping college students obtain basic training and research skills in scientific research, and cultivating students' sense of innovation, entrepreneurship and creativity.

The SRT program is a field bench in which students take the lead in extracurricular scientific research activities under the guidance of teachers. Participants are mainly undergraduates. The SRT program implements a two-way selection of mentors and classmates, and students can choose projects according to their own situation.

The scope of knowledge covered in the SRT program is broader than in the classroom. In this process, students can give full play to their independent work ability and initiative, and cultivate students' critical spirit of independent thinking and daring to doubt. Students can be "self-centered", and carry out independent ability training in investigation and research, literature review, analysis and argumentation, formulation of plans, design or experiments, analysis and summary, etc., and the tutor will play a leading role.

Students who complete the SRT program can obtain corresponding credits and grades, and those who have reached a certain level in the Songhong Brigade can also replace their related course design and even graduation project.

The discovery of the strontium element strontium started with a type of ore. Around 1787, an ore mined from the lead mines of the Entrantian region of Scotland, England, was exhibited at some European exhibitions. Some chemists believe that it is a type of fluorite.

In the 1790s, the British physician Crawford analyzed and studied this ore, dissolved it in hydrochloric acid, and obtained a chloride that differed from barium chloride in many ways. The solubility of this chloride in water is greater than that of barium chloride, and the solubility in hot water is much greater than that in cold water, and the effect of lowering the temperature after dissolving in water is greater. It is also different from the crystalline form of barium chloride.

He thinks there may be a new soil (oxide) in it.

Shortly thereafter, around 1791 to 1792, the English chemist and physician Hope studied the ore again and determined that it was carbonate, but unlike barium carbonate, it must contain a new soil, which was named Strontia (strontium earth) from its place of origin, Strontian. He pointed out that strontium soil absorbs water more easily than lime and heavy soil, that it is soluble in water, and that it dissolves in much larger quantities in hot water than in cold water. And he pointed out that its compounds produce bright red in flames, while barium's compounds appear green in flames.