![]() ![]() The elements in this group are also gases at room temperature.Īn alternate numbering system numbers all of the \(s\), \(p\), and \(d\) block elements from 1-18. We will learn the reason for this later, when we discuss how compounds form. These elements also have similar properties to each other, the most significant property being that they are extremely unreactive, rarely forming compounds. This group contains very reactive nonmetal elements. Group 7A (or 17) elements are also called halogens. It is important to recognize a couple of other important groups on the periodic table by their group name. Remember, Mendeleev arranged the table so that elements with the most similar properties were in the same group on the periodic table. The same pattern is true of other groups on the periodic table. Once again, because of their similarities in electron configurations, these elements have similar properties to each other. ![]() Group 2A is also called the alkaline earth metals. Although most metals tend to be very hard, these metals are actually soft and can be easily cut. Group 1A is also known as the alkali metals. Because of their similarities in their chemical properties, Mendeleev put these elements into the same group. The elements in 1A are all very reactive and form compounds in the same ratios with similar properties with other elements. This is what causes these elements to react in the same ways as the other members of the family. All of the 1A elements have one valence electron. A group is a vertical column of the periodic table. Remember that Mendeleev arranged the periodic table so that elements with the most similar properties were placed in the same group. Since then, chromium has become a common and widely used metal.\) He later found trace amounts of chromium in precious gemstones. In the late 1700s, French chemist Louis Nicolas Vauquelin was able to isolate chromium by baking crocoite ore samples in an oven. It was actually discovered back in the 18th century. Many people assume that chromium is a new metal that was just recently discovered, but this isn’t necessarily true. #5) It Was Discovered In the 18th Century In fact, it reflects nearly 90% of IR light. It’s also important to note that chromium can reflect infrared (IR) light. Its reflective properties make it ideal for use in applications where aesthetics is a priority. When placed near a source of illumination, 70% of the visible light that strikes chromium will bounce off its source. Research shows that chromium reflects nearly 70% of visible light. #4) It Reflects Nearly 70% of Visible LightĬhromium is prized for its lustrous appearance. With that said, chromium is still brittle, meaning it can break or shatter easily. It’s is harder than iron, stainless steel, tungsten and even titanium. In fact, it’s the world’s hardest metal based on the Moh’s Hardness Scale, with a rating of 9.0. #3) It’s the Hardest MetalĪside from its anti-rusting properties, chromium is exceptionally hard. The lustrous metal is typically added as a plating over stainless steel, at which point the chromium prevents oxygen from reaching the iron - something that could otherwise lead to rusting. While stainless steel contains iron, chromium is used to shield the iron, thereby protecting it from rusting. Rusting is a phenomenon that only occurs with iron. #2) It Doesn’t RustĬhromium is used in the production of stainless steel because of its natural anti-rusting properties. ![]() With that said, most types of stainless steel have a minimum chromium content of 11%. The ratio of these ingredients varies depending on the type of stainless steel being produced. Also known as inox steel, stainless steel is made by smelting and mixing a combination of raw iron, chromium and carbon. It’s a little-known fact that stainless steel contains chromium. To learn more about this lustrous metal, keep reading. These are just a few common applications for Chromium. Motorcycles, for example, often feature chromium-coated components, whereas silverware may feature a similar type of chromium plating. Featuring a lustrous chrome appearance, it’s used in a variety of applications. ![]() Chromium is one of 91 metal elements on the periodic table. ![]()
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