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
There are a number of professional associations, some of which offer training and certification. The Society for Human Resource Management, which is based in the United States, is the largest professional association dedicated to HR, with over 250,000 members in 140 countries.It offers a suite of Professional in Human Resources (PHR) certifications through its HR Certification Institute.here are a number of professional associations, some of which offer training and certification. The Society for Human Resource Management, which is based in the United States, is the largest professional association dedicated to HR, with over 250,000 members in 140 countries.