Chemical elements

Chlorine The element chlorine is located in the 7th group in the periodic table it is the symbol for CI. Chlorine is a chemical element it has a atomic mass of 35. Chlorine has 17 protons, 18 neutrons, and 17 electrons. The electron configuration for chlorine is 3s2-3p5. Chlorine has a boiling point of 3.16, and is family with halogen. Chlorine was discovered in 1774 by Carl Wilhelm Scheele. He obtained it through the reaction of the mineral pyrolusite manganese dioxide with hydrochloric acid.…

Phosphorus: General: Phosphorus is one of chemical elements of periodic table with atomic number 15 and atomic mass 30.9738 g/mol. Phosphorus is one of members of polyvalent non-metal of Nitrogen group and can be found in nature as some different allotropic format. Phosphorus can not be found free in nature since it’s so reactive and while it’s isolated and pure, it is clear and almost transparent. Phosphorus can be found in three common forms as white, red and black which their particular…

is an element that many people have either felt or seen without realizing it. Pennies, for example, are made of copper. Certain pipes, contraceptives, and wires are other ways copper is used in our daily lives. It 's a great conductor of electricity, antibacterial, and corrosion resistant. However, this raises the question: what exactly are the properties of copper that give it its properties? An element is a chemical substance in its simplest form. An atom is the basic unit of a chemical…

Introduction Lead (Pb) contamination is a pervasive issue in many low-income neighborhoods throughout the United States. The toxicity of lead poses significant risks to human health, and proves to be especially harmful for children in terms of cognitive and physical development. Lead in the environment is primarily related to a legacy of anthropogenic sources including leaded gasoline, leaded paint, and various industrial applications. Although the presence of heavy metals is ubiquitous in the…

Russell: Henry Norris Russell was born in October 25, 1877 and died February 18, 1957. He dedicated Sixty years at Princeton University, as a student and professor. Russell, like many in this time, believed that stars were composed of the same identical elements that are present on Earth. The shared belief of physicists at the time was, “what we know here, must be true out there.” This changed in the 19th century when the use of spectrography arose. Spectrography was first developed by…

Group 1 Elements Referring to the table created from observing the characteristics of the three elements from group 1, Lithium, Sodium, and Potassium, we can see that they all share the appearance of being lustrous and metallic, with a silvery-white presentation, and it is also known that they are all alkali metals. It is also noticed that they are all soft metals easily cut with a knife rather than most metals such as calcium or iron. All three elements are stored within oil, with Sodium as an…

Explain this using the information in the chemical equation. The magnesium did not leave a significant odor because it is a pure metal, and pure metals are known for not leaving a distinguished scent when burned. 2MgO also tells us that oxygen is also the final reactant in reaction #2, and we know…

as if the bright colors on the chart were generating warmth (energy) and that chart was an exhibit of the Periodic Table. For years, different people ventured to group elements by their chemical traits. However, Dmitri Ivanovich Mendeleyev (1834-1907) a Russian chemist is first to devise a periodic table of elements.…

associated with human diseases. Our current knowledge of chemical induced adverse health effects is mainly limited to the toxicity of the individual chemicals. For the majority of chemicals, its individual toxicity is well documented, examples arsenic and skin, lung and bladder cancers; dioxin and chloracne; lead and neurotoxicity; benzo[a]pyrene and lung cancer. The scientific community increasingly recognizes the adverse effects associated with chemical mixtures are a serious concern. The task…

down into five individual branches. Analytical chemistry attempts to determine the exact chemical compositions of substances through the measuring the physical and chemical properties of matter. Physical chemistry is the combination of chemistry and physics analysing the physical make up of chemical properties and the interactions between energy and matter. Organic chemistry, is heavily based on the element of carbon and its relation with life. Due to carbon’s complex and unique properties…