Chemical element

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    Every element has its own symbol ,atomic number ,and atomic mass. The symbol is letters of the element, atomic number is the number of protons, and atomic mass is the mass of the element. The Symbol for Calcium is `Ca’ and the atomic number is 20, and the mass number is 40.078 u. Family. The periodic table is classified into groups and every group(row) has its own properties. Calcium is in group 2 ,and this is the second most reactive group of the periodic table. Each of the elements in…

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    Argon is the element i picked for the project. Argon is a chemical element with symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the most abundant gas in the earth's atmosphere. It makes up 1.28% of the atmosphere. It was one of the first noble gases to be discovered. It is a colorless, odorless, and non-toxic material in all three of its states. Henry cavendish proposed in 1785 that argon might exist. Lord rayleigh and sir william ramsay…

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    The Periodic Table

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    organizing elements by atomic numbers and chemical properties into groups and periods. The periodic table was created in order to easily find and classify the different elements that are known. Elements are pure substances composed of just one type of atom that cannot be broken down into anything simpler by ordinary chemical means. Some examples are Oxygen, Carbon, Gold, and Silver. [Source A] An atomic number is the number of protons or electrons in an atom, the number that appears over the…

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    Mendeleev’s periodic table was categorizing the elements according to their physical and chemical characteristics with regard to their atomic weights. Mendeleev was the first to come up with a structure for the periodic table with columns and rows. There were other scientists who have worked on tabulating information of the elements even before Mendeleev, however, he was the first scientist to come up with a periodic trend to predict the properties of elements which were not discovered at that…

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    Lithium And Electrons

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    Lithium is the chemical element of atomic number 3, a soft silver-white metal. It is the lightest of the alkali metals. The two main parts of every atom are neutrons and protons. The three main subatomic particles that form an atom are protons, neutrons, and electrons. Electrons are the smallest of the three particles that make up atoms. Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center…

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    that make up chemical compounds. Throughout the rest of 18th century, investigation into chemical species continued and soon experimentation gave rise to laws and theories. One of the most…

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    The Element Of Magnesium

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    The element Magnesium got its name when it was discovered. It is a silvery white metal that is highly reactive. Its chemical symbol is Mg and atomic number is 12. Its atomic mass is relatively 24. Therefore, it has 12 protons, 12 neutrons, and 12 electrons. According to Steve Gagnon in “The Element Magnesium” Magnesium was isolated by Sir Humphry Davy, an English chemist, through the electrolysis of a mixture of magnesium oxide and mercuric oxide in 1808. Magnesium has a melting point of 650°…

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    Astatine Research Paper

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    included in the periodic table of elements with the abbreviation At and an atomic number of 85. Considered a Halogen and sharing many traits of Halogens, especially Iodine, astatine lies in column seven and period six of the current periodic table. Like many of the elements, astatine’s initial inspiration for discovery was to fill-in a missing part of the periodic table. In 1872, Dimitri Ivanovich Mendeleev wrote a paper on the periodic table which included the element francium. As noted in…

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    Fluorine Research Paper

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    Fluorine is an element on the periodic table. Fluorine atomic number is 9. Fluorine is a chemical that looks pale and yellow. The atomic weight is 18.9984032 and the density is 0.001696 grams per cubic centimeter. Fluorine is a non-medal the period number is 2 its group number is 17 and the halogen. Fluorine is a gas. Fluorine was discovered by Henri Moissanin 1886. Ferdinand Frederick Henri Moissan was a French chemist who won the 1906 Nobel Prize in Chemistry for his work in isolating…

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    table of elements” on the base of periodic repetition of properties. In 1864, before Mendeleev, and John Newlands arranged the elements in order of atomic mass where every eight elements has similar properties. He called the relationship “the law of octaves”. Even so, this law could not be applied for the elements beyond Calcium, so it was not accepted by the scientific community. The modern periodic table is thought to be the outermost ground-state electron configuration of the elements. The…

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