This interactive connect 4 game is a review of determining protons neutrons and electrons for ions, isotopes and atoms. The students are given color coded index cards (printable word doc) and were asked to solve the questions in rainbow order (red, orange, yellow, green, blue, purple, hot pink, white). The students answered the questions on white boards and shouted the color (ie: red!) so that I knew which card they were up to. I had anywere from 4 groups of 4 to 6 groups of 4 depending on th