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Hace 20 horas · Oxygen is a chemical element; it has symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is the most abundant element in Earth's crust, and after hydrogen and helium, it ...
Hace 20 horas · A job applicant with a facial expression indicative of anxiety Mental state in terms of challenge level and skill level, according to Csikszentmihalyi's flow model. ( Click on a fragment of the image to go to the appropriate article) Anxiety is an emotion which is characterised by an unpleasant state of inner turmoil and includes feelings of dread over anticipated events.
