Sulfur is essential to life and a minor constituent of fats, body fluids, and skeletal minerals. It is an odourless, pale yellow and brittle solid, insoluble in water but soluble in carbon disulfide. It can be found in multiple forms: gas, liquid, or solid.

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Titanium metal is physiologically inert. Natural titanium consists of five stable isotopes, and eight other unstable isotopes are known. Not only did Mendeleev arrange the elements in the correct way, but he also had the foresight to leave gaps for undiscovered elements. Over time these gaps have gradually been filled in as scientists unearthed new elements. For instance they discovered phosphorus when they isolated it from urine.Chlorine is used to produce safe drinking water and in the making of paper products, dyestuffs, textiles, petroleum products, medicines, antiseptics, insecticides, food, solvents, paints, plastics, and many other products. Calcium (Ca) - 1.5% - Calcium is the most abundant mineral in the body. It's used as a structural material in bones, but it is essential for protein regulation and muscle contraction. A simple shorthand system is used for representing elements. The symbol for the element is the first letter of its English or Latin name, written as a capital letter. If several elements have the same first letter, a second, lower case letter is added. The modern periodic table is based on Dmitri Mendeleev’s 1896 observations that chemical elements can be grouped according to common chemical properties

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The ancient Greeks thought that there were just four elements - earth, air, fire and water. However, we now know that there are actually 118 chemical elements . Everything on Earth and in the solar system is made from these elements.The earliest attempt to classify the elements was in 1789, when Antoine Lavoisier grouped the elements based on their properties into gases, non-metals, metals and earths. Several other attempts were made to group elements together over the coming decades. The periodic table can be read across from left to the right along the rows horizontally. It can also be read up and down the vertical columns.

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A compound is a pure substance that is made from more than one element. In a compound, elements are chemically bonded together, which makes it very difficult to separate them. The existence of promethium was predicted in 1902 and confirmed in 1914, though searches for it on earth have been unsuccessful. Actually, the elements in the bottom rows are the extension of group 3 only. So they are included in group 3.As the heaviest known gas, radon is essentially inert. It’s also radioactive, has 39 known isotopes, and is found in soil and some hot springs. It’s a colourless gas at ambient temperatures and a brilliant yellow phosphorescent colour below its freezing point. Symbol W is from Wolfram, originally from Middle High German wolf-rahm 'wolf's foam' describing the mineral wolframite [5]

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This element is silvery white with a metallic lustre, and, as a powder, can be consolidated, annealed, bent, coiled, or rolled. Natural rhenium is a mixture of two stable isotopes; the other 26 are unstable. In this way, the elements of the same group show similar chemical properties and they also have the same number of valence electrons. Free Gift for you: Interactive Periodic Table Found mostly in celestite and strontianite minerals, strontium can be used in medical imaging, ferrite magnet making, and zinc refining. It’s a white, crystalline, and brittle metal with a pinkish tinge. The element occurs naturally in the ores bismuthinite (bismuth glance) and bismite. And when it’s heated in air, it produces a blue flame and forms yellow fumes.Meitnerium has no stable or natural isotopes; it’s formed by the fusion of two atoms or the decay of heavier elements. Eight isotopes have been reported, two with metastable states. Most isotopes undergo alpha decay or spontaneous fission. To break apart the elements in a compound, a chemical reaction must take place, for example, electrolysis or thermal decomposition . However, when elements make a mixture, then through a physical process such as filtration or crystallisation, it is possible to separate them. Discovered in 1782 and isolated in 1798, tellurium in its crystalline form is brittle and silvery-white with a metallic lustre. A transition metal is defined by IUPAC as "an element whose atom has a partially filled sub-shell, or which can give rise to cations with an incomplete sub-shell”. Transition metals are found in Groups 4 to 11 of the Periodic Table of the Elements in Groups 3 and 12 are sometimes included.