{"id":9838,"date":"2017-05-26T11:55:48","date_gmt":"2017-05-26T06:25:48","guid":{"rendered":"http:\/\/www.generalknowledgetoday.com\/?p=9838"},"modified":"2017-05-26T11:55:48","modified_gmt":"2017-05-26T06:25:48","slug":"chromium-chromium-atomic-characteristics","status":"publish","type":"post","link":"https:\/\/generalknowledgetoday.com\/?p=9838","title":{"rendered":"Chromium- All about Chromium and its Atomic Characteristics"},"content":{"rendered":"\n\n\n\n
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Chromium<\/span><\/h2>\n<\/div>\n<\/th>\n<\/tr>\n

\n
\n\n\n\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Cr<\/th>\n<\/tr>\n
Atomic Number<\/th>\n24<\/th>\n<\/tr>\n
Atomic Mass<\/th>\n51.9961<\/th>\n<\/tr>\n
Atomic radius<\/th>\n0.117<\/th>\n<\/tr>\n
Ionization energy<\/th>\n652<\/th>\n<\/tr>\n
Electronic config<\/th>\n2,8,13,1<\/th>\n<\/tr>\n
Principal Valency<\/th>\n+3 and +6<\/th>\n<\/tr>\n
Density g\/cm3<\/sup><\/th>\n7.14<\/th>\n<\/tr>\n
Melting point o<\/sup>C<\/th>\n1907<\/th>\n<\/tr>\n
Boiling point o<\/sup>C<\/th>\n2671<\/th>\n<\/tr>\n
Type of Element<\/th>\nMetal<\/th>\n<\/tr>\n
Electronegativity<\/th>\n1.6<\/th>\n<\/tr>\n
Appearance<\/th>\nGray solid<\/th>\n<\/tr>\n
Block<\/th>\nd-block<\/th>\n<\/tr>\n
Period<\/th>\n4<\/th>\n<\/tr>\n
Group<\/th>\n6<\/th>\n<\/tr>\n
No of Isotopes<\/th>\n26<\/th>\n<\/tr>\n
Occurrence<\/th>\nCombine form<\/th>\n<\/tr>\n
Abundance in ppm<\/th>\n122<\/th>\n<\/tr>\n
Year of Discovery<\/th>\n1797<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
INTRODUCTION<\/th>\n<\/tr>\n
Chromium is a common element,with about 21st in natural abundance among the elements in crustal rocks.Many precious stones owe their colour to the presence of chromium compounds.<\/td>\n<\/tr>\n
It can replace part of the aluminum or iron in many minerals,imparting to them their unique colors and it can take on a high polish.Its name is derive fromthe Greek word Chroma (colour) due to the various colour of its compounds.<\/td>\n<\/tr>\n
EXTRACTION<\/th>\n<\/tr>\n
It is obtain by reducing it’s oxide<\/td>\n<\/tr>\n
OXIDATION STATES<\/th>\n<\/tr>\n
+6,+5,+4,+3,+2,-1,-2 (Strongly acidic)<\/td>\n<\/tr>\n
ELEMENT CATEGORY<\/th>\nMAJOR SOURCE<\/th>\n<\/tr>\n
Chromium Group<\/td>\nChromite<\/td>\n<\/tr>\n
EXAMPLES OF COMPOUND PRESENT<\/th>\n<\/tr>\n
Chromic oxide, Potassium dichromate, lead chromate<\/td>\n<\/tr>\n
ECONOMIC IMPORTANCE<\/th>\n<\/tr>\n
* Chromium makes up 10 percent or more of the final composition of the stainless steels.<\/td>\n<\/tr>\n
* Due to its hardness,an alloy of chromium,cobalt and tungsten is used for high-speed metal-cutting tools.<\/td>\n<\/tr>\n
* It is used extensively as a refractory due to its high melting point,its moderate thermal expansion and the stability of its crystalline structure.<\/td>\n<\/tr>\n
* It serve as an important ingredient in several catalysts.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Chromium Cr Atomic Number 24 Atomic Mass 51.9961 Atomic radius 0.117 Ionization energy 652 Electronic config 2,8,13,1 Principal Valency +3 and +6 Density g\/cm3 7.14 Melting point oC 1907 Boiling … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":9840,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,952],"tags":[945,946,947,948,949,950,951],"class_list":["post-9838","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-club","category-scientific-terminologies","tag-atomic-characteristics","tag-atomic-elements","tag-atomic-features-of-chromium","tag-chromium","tag-chromium-and-its-atomic-characteristics","tag-chromium-all-about-chromium-and-its-atomic-characteristics","tag-science-class-room","entry"],"_links":{"self":[{"href":"https:\/\/generalknowledgetoday.com\/index.php?rest_route=\/wp\/v2\/posts\/9838","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/generalknowledgetoday.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/generalknowledgetoday.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/generalknowledgetoday.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/generalknowledgetoday.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9838"}],"version-history":[{"count":0,"href":"https:\/\/generalknowledgetoday.com\/index.php?rest_route=\/wp\/v2\/posts\/9838\/revisions"}],"wp:attachment":[{"href":"https:\/\/generalknowledgetoday.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9838"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/generalknowledgetoday.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9838"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/generalknowledgetoday.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9838"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}