28-year-old man, emigrated from the Philippines Positive tuberculin skin test No active tuberculosis Symptoms: weight loss, cough, and night sweats Treatment: daily dose of isoniazid for 9 months Two weeks later: report of progressive fatigue, intermittent bouts of nausea, abdominal pain, darkened urine, light colored stools. The patient's sister noticed yellowing of his eyes and skin. Blood test: Increase in serum bilirubin and aminotransferases. The isoniazid was discontinued, and patient's symptoms subsided. Cause of Condition? Diagnosis?

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oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.