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Chromium is a solid located in period 4 and in group 6B on the periodic table of elements Which would classify it as a transition metal Its crystal structure is cubic and its melting point is 18570 degrees C 213015 K 33746 degrees F Chromiums Boiling point is at 26720 degrees C 294515 K 48416 degrees F Its atomic number is 24 and is a gray solid All its stable isotopes are Cr-50 Cr-52 Cr-53 Cr-54 and its unstable are Cr-49 and Cr-51 Chromiums atomic mass is 519961 amu Chromium has 24 protons and 24 electrons It also has 28 neutrons The atomic structure of chromium is as follows on the first level there are 2 electrons on the second level there are 8 electrons on the third level there are 13 electrons and on the fourth level there is one electron Of Course all the protons and neutrons are in the nucleus In the 18th century an analysis of red lead PbCrO4 crocoite from Siberia showed an unidentified material Louis-Nicholas Vauquelin later identified the unidentified material as chromium oxide in 1797 He started by powdering the red lead and precipitated the lead out through its reaction with hydrochloric acid That left the chromium oxide He then heated the oxide in an oven with charcoal as a reducing agent to get the metal chromium Chromium was also found in an emerald analyzed by Vauquelin He discovered that the chromium gave the emerald its green color The word chromium is from the Greek word chroma which means color named this because of the many different colored compounds made with it A German chemist named Tassaert found chromium in an ore now called chromite just a few years after Vauquelin discovered it This ore Fe CrO2 2 is now an important source of chromium Today the element chromium must be separated from its compounds to get it because it is not found freely in nature Chromium is
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