Sulfur exists in two allotropic forms. Allotropes are forms of an element with different physical and chemical properties. The two forms of sulfur are known as Î±-form and Î²-form (the Greek letters alpha and beta, respectively).
National Organizations American Psychological Association (APA) The American Psychological Association (APA) is located in Washington, D.C., and is the largest scientific and professional organization representing psychology in the United States. APA was founded at the turn of the 20th century, and is the world's largest association of psychologists. APA - Division 16 - Division of School Psychology
The American Psychological Association estimates that there are about 105,000 licensed psychologists in the United States. What they do. Practicing psychologists help a wide variety of people and can treat many kinds of problems. Some people may talk to a psychologist because they have felt depressed, angry or anxious for a long time. Or, they want help for a chronic condition that is interfering with their lives or physical health.