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
2017 APA Annual Meeting - American Psychiatric Association. APAâs Annual Meeting is the premier psychiatry event of the year. With over 450 educational sessions and courses, there is no better event to help you expand your knowledge, network, and meet certification and licensure requirements. Learn from renowned psychiatry thought-leaders.