Icon Chem Quiz

All questions are presented by the icon pictures and scores are given if the answer is correct. There are two modes. 1) Rush Mode: the user needs to answer the quiz before time is up. The time limit is 90 seconds. The quicker they user answers the question, the higher score he/she will get. All the quiz questions are about the Chemical elements which include a symbol, a number, and a mass.
2) Icon Mode: All the quiz questions will be randomly picked with different levels as easy, normal, and hard. Take your time to name the famous scientists (chemists). Elements in daily life that will be presented with icon picture. If you can answer it, you can get it. Make your icon collection to tell the world what you know.