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why filling of 4s takes place before 3d.. why chromium and copper have exceptional configuration ..please help me.. don't spam and don't post irrelevant answers..
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10, 1948, the United Nations General Assembly (UNGA) adopted the Universal Declaration of Human Rights (UDHR) Article 25, which states that: “Everyone has the right to a standard of living adequate for the health and well-being of himself and of his family, including food, clothing, housing and medical care
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